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

2.16 — Interview Questions: Performance Optimization in React

Maps to 2.16.a–2.16.f.

Beginner — Q1

What does `React.memo` do?

Model answer: It memoizes a function component so React can skip rendering it if props are shallowly equal to the previous render (unless a custom comparator says otherwise).

Beginner — Q2

Why might `memo` not prevent renders?

Model answer: Props likely change by reference each parent render (inline objects/functions), context updated, or the component has internal state updates.

Beginner — Q3

What is shallow equality?

Model answer: A per-prop comparison using Object.is semantics; nested objects/arrays compare by reference, not deep structure.

Intermediate — Q4

When is `useMemo` appropriate?

Model answer: When profiling shows expensive pure derivation or when you need referential stability for downstream memoization— not for trivial work.

Intermediate — Q5

What stale closure risks come from `useCallback`?

Model answer: Missing dependencies can freeze values; over-memoizing can hide dependency issues until runtime.

Intermediate — Q6

How does code splitting help React apps?

Model answer: It reduces initial JS parse/compile/execute costs and improves time-to-interactive by loading features on demand—pair with Suspense and error UX.

Advanced — Q7

How do you debug ‘slow’ without guessing?

Model answer: Start with user interaction traces: React Profiler for component time, Performance panel for layout/paint, Lighthouse for lab guidance, RUM for field vitals.

Advanced — Q8

What is dangerous about custom `memo` comparators?

Model answer: Returning true incorrectly skips updates → stale UI; they need tests like business logic.

Advanced — Q9

Why is virtualization often more impactful than memo for huge lists?

Model answer: Memo reduces repeat render work, but DOM node count and layout cost can still dominate; virtualization reduces work fundamentally.

Beginner — Q10

Does `React.memo` help if the component uses `useState` internally?

Model answer: The child still re-renders when its own state changes. memo only helps skip renders driven by parent updates with stable props.

Intermediate — Q11

Why can context cause `memo` to appear broken?

Model answer: memo compares props, not context. If a context value changes, consumers re-render even if props are stable unless you restructure context or selectors.

Intermediate — Q12

What is the difference between `useMemo` and `useCallback`?

Model answer: useMemo memoizes a computed value; useCallback memoizes a function identity. Under the hood useCallback(fn, deps) is equivalent to useMemo(() => fn, deps) conceptually.

Intermediate — Q13

When is `React.lazy` inappropriate?

Model answer: For tiny modules where splitting adds more overhead than benefit, or when you cannot provide acceptable loading/error UX around the boundary.

Advanced — Q14

How do you compare Lighthouse lab scores to field vitals?

Model answer: Use lab scores to find obvious payload/render-blocking issues reproducibly; use RUM distributions (p75/p95) to validate what real devices and networks experience.

Advanced — Q15

What signals suggest layout thrash instead of React render cost?

Model answer: High 'Recalculate Style' / 'Layout' blocks in Performance traces, large DOM mutations, or expensive CSS features—Profiler render time may look modest while UX is janky.

Beginner — Q16

What does `Suspense` do around `React.lazy`?

Model answer: It shows a fallback UI while the lazy chunk is loading and coordinates async rendering boundaries for that subtree.

Intermediate — Q17

Why should expensive work not live inside `useMemo` if it has side effects?

Model answer: useMemo may be discarded/re-run depending on rendering; side effects belong in event handlers or useEffect with clear dependencies.

Advanced — Q18

How do you prevent prefetch waterfalls with route-level splitting?

Model answer: Prefetch on user intent, parallelize independent imports, prioritize critical routes, and validate network waterfalls in DevTools Network + Performance panels.

Quick-fire table

#	Question	One-line
1	memo compares	props shallowly
2	useMemo returns	memoized value
3	useCallback returns	memoized function
4	lazy needs	Suspense fallback (typically)
5	Lighthouse is	lab audit tool
6	Profiler shows	component timings across commits

Deep bank — rapid cards (self-check)

R001

Prompt: Explain scenario 1 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R002

Prompt: Explain scenario 2 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R003

Prompt: Explain scenario 3 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R004

Prompt: Explain scenario 4 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R005

Prompt: Explain scenario 5 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R006

Prompt: Explain scenario 6 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R007

Prompt: Explain scenario 7 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R008

Prompt: Explain scenario 8 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R009

Prompt: Explain scenario 9 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R010

Prompt: Explain scenario 10 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R011

Prompt: Explain scenario 11 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R012

Prompt: Explain scenario 12 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R013

Prompt: Explain scenario 13 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R014

Prompt: Explain scenario 14 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R015

Prompt: Explain scenario 15 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R016

Prompt: Explain scenario 16 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R017

Prompt: Explain scenario 17 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R018

Prompt: Explain scenario 18 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R019

Prompt: Explain scenario 19 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R020

Prompt: Explain scenario 20 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R021

Prompt: Explain scenario 21 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R022

Prompt: Explain scenario 22 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R023

Prompt: Explain scenario 23 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R024

Prompt: Explain scenario 24 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R025

Prompt: Explain scenario 25 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R026

Prompt: Explain scenario 26 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R027

Prompt: Explain scenario 27 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R028

Prompt: Explain scenario 28 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R029

Prompt: Explain scenario 29 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R030

Prompt: Explain scenario 30 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R031

Prompt: Explain scenario 31 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R032

Prompt: Explain scenario 32 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R033

Prompt: Explain scenario 33 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R034

Prompt: Explain scenario 34 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R035

Prompt: Explain scenario 35 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R036

Prompt: Explain scenario 36 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R037

Prompt: Explain scenario 37 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R038

Prompt: Explain scenario 38 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R039

Prompt: Explain scenario 39 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R040

Prompt: Explain scenario 40 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R041

Prompt: Explain scenario 41 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R042

Prompt: Explain scenario 42 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R043

Prompt: Explain scenario 43 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R044

Prompt: Explain scenario 44 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R045

Prompt: Explain scenario 45 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R046

Prompt: Explain scenario 46 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R047

Prompt: Explain scenario 47 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R048

Prompt: Explain scenario 48 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R049

Prompt: Explain scenario 49 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R050

Prompt: Explain scenario 50 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R051

Prompt: Explain scenario 51 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R052

Prompt: Explain scenario 52 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R053

Prompt: Explain scenario 53 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R054

Prompt: Explain scenario 54 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R055

Prompt: Explain scenario 55 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R056

Prompt: Explain scenario 56 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R057

Prompt: Explain scenario 57 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R058

Prompt: Explain scenario 58 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R059

Prompt: Explain scenario 59 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R060

Prompt: Explain scenario 60 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R061

Prompt: Explain scenario 61 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R062

Prompt: Explain scenario 62 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R063

Prompt: Explain scenario 63 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R064

Prompt: Explain scenario 64 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R065

Prompt: Explain scenario 65 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R066

Prompt: Explain scenario 66 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R067

Prompt: Explain scenario 67 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R068

Prompt: Explain scenario 68 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R069

Prompt: Explain scenario 69 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R070

Prompt: Explain scenario 70 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R071

Prompt: Explain scenario 71 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R072

Prompt: Explain scenario 72 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R073

Prompt: Explain scenario 73 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R074

Prompt: Explain scenario 74 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R075

Prompt: Explain scenario 75 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R076

Prompt: Explain scenario 76 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R077

Prompt: Explain scenario 77 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R078

Prompt: Explain scenario 78 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R079

Prompt: Explain scenario 79 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R080

Prompt: Explain scenario 80 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R081

Prompt: Explain scenario 81 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R082

Prompt: Explain scenario 82 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R083

Prompt: Explain scenario 83 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R084

Prompt: Explain scenario 84 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R085

Prompt: Explain scenario 85 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R086

Prompt: Explain scenario 86 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R087

Prompt: Explain scenario 87 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R088

Prompt: Explain scenario 88 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R089

Prompt: Explain scenario 89 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R090

Prompt: Explain scenario 90 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R091

Prompt: Explain scenario 91 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R092

Prompt: Explain scenario 92 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R093

Prompt: Explain scenario 93 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R094

Prompt: Explain scenario 94 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R095

Prompt: Explain scenario 95 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R096

Prompt: Explain scenario 96 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R097

Prompt: Explain scenario 97 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R098

Prompt: Explain scenario 98 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R099

Prompt: Explain scenario 99 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R100

Prompt: Explain scenario 100 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R101

Prompt: Explain scenario 101 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R102

Prompt: Explain scenario 102 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R103

Prompt: Explain scenario 103 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R104

Prompt: Explain scenario 104 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R105

Prompt: Explain scenario 105 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R106

Prompt: Explain scenario 106 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R107

Prompt: Explain scenario 107 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R108

Prompt: Explain scenario 108 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R109

Prompt: Explain scenario 109 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R110

Prompt: Explain scenario 110 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R111

Prompt: Explain scenario 111 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R112

Prompt: Explain scenario 112 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R113

Prompt: Explain scenario 113 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R114

Prompt: Explain scenario 114 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R115

Prompt: Explain scenario 115 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R116

Prompt: Explain scenario 116 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R117

Prompt: Explain scenario 117 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R118

Prompt: Explain scenario 118 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R119

Prompt: Explain scenario 119 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R120

Prompt: Explain scenario 120 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R121

Prompt: Explain scenario 121 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R122

Prompt: Explain scenario 122 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R123

Prompt: Explain scenario 123 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R124

Prompt: Explain scenario 124 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R125

Prompt: Explain scenario 125 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R126

Prompt: Explain scenario 126 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R127

Prompt: Explain scenario 127 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R128

Prompt: Explain scenario 128 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R129

Prompt: Explain scenario 129 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R130

Prompt: Explain scenario 130 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R131

Prompt: Explain scenario 131 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R132

Prompt: Explain scenario 132 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R133

Prompt: Explain scenario 133 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R134

Prompt: Explain scenario 134 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R135

Prompt: Explain scenario 135 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R136

Prompt: Explain scenario 136 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R137

Prompt: Explain scenario 137 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R138

Prompt: Explain scenario 138 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R139

Prompt: Explain scenario 139 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R140

Prompt: Explain scenario 140 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R141

Prompt: Explain scenario 141 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R142

Prompt: Explain scenario 142 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R143

Prompt: Explain scenario 143 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R144

Prompt: Explain scenario 144 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R145

Prompt: Explain scenario 145 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R146

Prompt: Explain scenario 146 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R147

Prompt: Explain scenario 147 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R148

Prompt: Explain scenario 148 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R149

Prompt: Explain scenario 149 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R150

Prompt: Explain scenario 150 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R151

Prompt: Explain scenario 151 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R152

Prompt: Explain scenario 152 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R153

Prompt: Explain scenario 153 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R154

Prompt: Explain scenario 154 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R155

Prompt: Explain scenario 155 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R156

Prompt: Explain scenario 156 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R157

Prompt: Explain scenario 157 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R158

Prompt: Explain scenario 158 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R159

Prompt: Explain scenario 159 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R160

Prompt: Explain scenario 160 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R161

Prompt: Explain scenario 161 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R162

Prompt: Explain scenario 162 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R163

Prompt: Explain scenario 163 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R164

Prompt: Explain scenario 164 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R165

Prompt: Explain scenario 165 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R166

Prompt: Explain scenario 166 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R167

Prompt: Explain scenario 167 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R168

Prompt: Explain scenario 168 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R169

Prompt: Explain scenario 169 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R170

Prompt: Explain scenario 170 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R171

Prompt: Explain scenario 171 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R172

Prompt: Explain scenario 172 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R173

Prompt: Explain scenario 173 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R174

Prompt: Explain scenario 174 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R175

Prompt: Explain scenario 175 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R176

Prompt: Explain scenario 176 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R177

Prompt: Explain scenario 177 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R178

Prompt: Explain scenario 178 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R179

Prompt: Explain scenario 179 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R180

Prompt: Explain scenario 180 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R181

Prompt: Explain scenario 181 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R182

Prompt: Explain scenario 182 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R183

Prompt: Explain scenario 183 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R184

Prompt: Explain scenario 184 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R185

Prompt: Explain scenario 185 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R186

Prompt: Explain scenario 186 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R187

Prompt: Explain scenario 187 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R188

Prompt: Explain scenario 188 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R189

Prompt: Explain scenario 189 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R190

Prompt: Explain scenario 190 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R191

Prompt: Explain scenario 191 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R192

Prompt: Explain scenario 192 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R193

Prompt: Explain scenario 193 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R194

Prompt: Explain scenario 194 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R195

Prompt: Explain scenario 195 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R196

Prompt: Explain scenario 196 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R197

Prompt: Explain scenario 197 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R198

Prompt: Explain scenario 198 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R199

Prompt: Explain scenario 199 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R200

Prompt: Explain scenario 200 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R201

Prompt: Explain scenario 201 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R202

Prompt: Explain scenario 202 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R203

Prompt: Explain scenario 203 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R204

Prompt: Explain scenario 204 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R205

Prompt: Explain scenario 205 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R206

Prompt: Explain scenario 206 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R207

Prompt: Explain scenario 207 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R208

Prompt: Explain scenario 208 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R209

Prompt: Explain scenario 209 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R210

Prompt: Explain scenario 210 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R211

Prompt: Explain scenario 211 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R212

Prompt: Explain scenario 212 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R213

Prompt: Explain scenario 213 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R214

Prompt: Explain scenario 214 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R215

Prompt: Explain scenario 215 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R216

Prompt: Explain scenario 216 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R217

Prompt: Explain scenario 217 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R218

Prompt: Explain scenario 218 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R219

Prompt: Explain scenario 219 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R220

Prompt: Explain scenario 220 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R221

Prompt: Explain scenario 221 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R222

Prompt: Explain scenario 222 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R223

Prompt: Explain scenario 223 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R224

Prompt: Explain scenario 224 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R225

Prompt: Explain scenario 225 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R226

Prompt: Explain scenario 226 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R227

Prompt: Explain scenario 227 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R228

Prompt: Explain scenario 228 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R229

Prompt: Explain scenario 229 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R230

Prompt: Explain scenario 230 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R231

Prompt: Explain scenario 231 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R232

Prompt: Explain scenario 232 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R233

Prompt: Explain scenario 233 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R234

Prompt: Explain scenario 234 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R235

Prompt: Explain scenario 235 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R236

Prompt: Explain scenario 236 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R237

Prompt: Explain scenario 237 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R238

Prompt: Explain scenario 238 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R239

Prompt: Explain scenario 239 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

R240

Prompt: Explain scenario 240 where memoization hurts more than helps.
Answer skeleton: Identify unstable deps / trivial compute / hidden stale UI; recommend measurement-first approach.

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