Episode 2 — React Frontend Architecture NextJS / 2.16 — Performance Optimization in React

2.16 — Quick Revision: Performance Optimization in React

One-page map

Tool	Fixes	Fails when
`React.memo`	Prop-stable expensive pure UI	Unstable props/context updates
`useMemo`	Costly derive / stable references	Deps change every render / trivial work
`useCallback`	Stable fn props / hook deps	Missing deps / unnecessary indirection
`lazy`+`Suspense`	JS payload / route splitting	Waterfalls / bad fallbacks
Lighthouse	Lab guidance + audits	Ignores real-user distributions if alone
DevTools Profiler	Render/commit insight	Misread without separating layout cost

Topic cheat sheets

Decision tree (narrative)

If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.
If users complain about slow first load, inspect bundle size + Lighthouse opportunities + server/TTFB; if they complain about interaction lag, start with Performance panel + INP thinking; if they complain about CPU fan on laptops, suspect long main-thread tasks.

Cheat 01

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 02

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 03

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 04

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 05

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 06

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 07

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 08

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 09

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 10

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 11

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 12

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 13

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 14

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 15

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 16

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 17

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 18

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 19

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 20

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 21

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 22

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 23

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 24

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 25

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 26

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 27

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 28

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 29

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 30

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 31

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 32

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 33

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 34

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 35

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 36

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 37

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 38

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 39

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 40

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 41

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 42

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 43

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 44

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 45

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 46

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 47

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 48

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 49

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 50

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 51

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 52

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 53

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 54

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 55

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 56

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 57

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 58

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 59

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 60

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 61

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 62

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 63

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 64

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 65

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 66

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 67

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 68

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 69

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 70

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 71

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 72

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 73

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 74

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 75

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 76

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 77

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 78

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 79

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 80

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 81

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 82

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 83

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 84

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 85

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 86

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 87

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 88

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 89

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 90

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 91

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 92

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 93

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 94

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 95

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 96

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 97

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 98

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 99

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 100

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 101

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 102

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 103

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 104

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 105

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 106

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 107

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 108

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 109

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 110

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 111

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 112

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 113

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 114

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 115

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 116

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 117

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 118

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 119

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Cheat 120

Measure: Profiler + Performance panel + Lighthouse/RUM.
Hypothesis: render vs layout vs network vs JS bundle.
Fix smallest structure: state locality → virtualization → memoization.
Prove: before/after metrics; watch for regressions in UX/a11y.

Self-check answers (spoken)

S001

Say aloud: ‘For problem class 1, I would reproduce in a minimal app, record a 10s Profiler trace, rank offenders, confirm prop stability, then apply the narrowest fix and validate with a second trace.’

S002

Say aloud: ‘For problem class 2, I would reproduce in a minimal app, record a 10s Profiler trace, rank offenders, confirm prop stability, then apply the narrowest fix and validate with a second trace.’

S003

Say aloud: ‘For problem class 3, I would reproduce in a minimal app, record a 10s Profiler trace, rank offenders, confirm prop stability, then apply the narrowest fix and validate with a second trace.’

S004

Say aloud: ‘For problem class 4, I would reproduce in a minimal app, record a 10s Profiler trace, rank offenders, confirm prop stability, then apply the narrowest fix and validate with a second trace.’

S005

Say aloud: ‘For problem class 5, I would reproduce in a minimal app, record a 10s Profiler trace, rank offenders, confirm prop stability, then apply the narrowest fix and validate with a second trace.’

S006

Say aloud: ‘For problem class 0, I would reproduce in a minimal app, record a 10s Profiler trace, rank offenders, confirm prop stability, then apply the narrowest fix and validate with a second trace.’