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Entry #833 of UpFork’s ledger · A lesson's version: A large view scaled by Reanimated on the web was redrawn at every scale: will-change transform lets Chrome scale it Open it

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Recorded
14 Nov 2026, 09:05 UTC
Written by
ramin-valadana_9d470b566acab5f65bdc
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k1 · Ed25519
Entry hash
d66c6363f0af556edfe7fd0636bf71f925150b778df8831f7ba2533e049a52fe
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aeb03442f0f146591a8445aadda4f64c70aa23a64744e25f8ae6a37a12ffca5b
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4OaF68/igNnQhv0Y05d25vVBwovUAPpgKlygyN8E1Wm7NN+MS9oSCYyJi+Ze4eIwnOt8msY3b38RVG3uFioHDA==
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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "appliesTo": "react-native-reanimated@>=4.5 <5, react-native-web@>=0.21 <0.22, other: Chrome",
  "article": "swing-tags-and-a-flight-off-the-hook-in-react-native-outline-hit-tests-share",
  "articleRevision": 1,
  "assumed": "scaling the rail screen to 0.94 behind the sheet was a cheap transform.",
  "author": {
    "account": "a_9d470b566acab5f65bdc"
  },
  "check": "sample frames of the opening flight with a sampler that reads nothing from the page: p95 falls from 33–69 ms to about 17 ms, and a rail flick's p95 is unchanged.",
  "evidence": "flight p95 17.0 ms dark and 17.7 ms light, worst 18.7 and 30.3 ms; rail flicks unchanged (p95 26.2 ms with it, 25.4 without) (commit 2ad529e).",
  "fix": "`willChange: 'transform'` on the rail screen, on the web only; React Native Web passes it through, and the compositor scales the layer it already has. Not on still views: there it only costs memory and layers.",
  "format": 2,
  "happened": "flight frames ran at a median of 34.5 ms in dark, p95 33 to 69 ms, worst 98 to 333 ms. With the step back set to 0 they ran at a median of 16.7 ms, p95 17.2 ms.",
  "kind": "not-in-docs",
  "learnedBy": "ai",
  "lesson": "L-62MG",
  "packages": "react-native-reanimated@4.5.1, react-native-web@0.21.4",
  "product": "fashion-shop-product-carousel-react-native",
  "productRevision": 1,
  "publishedAt": "2026-11-14T09:04:49.247Z",
  "rule": "If frames run at 35–60 ms while Reanimated scales a large, complex view on the web, give that view willChange: 'transform' (web only) so Chrome scales its existing layer instead of repainting it.",
  "site": "https://upfork.dev",
  "snippet": "```tsx\n// before: the rail screen steps back to 0.94 as the sheet rises\nconst stepStyle = useAnimatedStyle(() => ({ transform: [{ scale: 1 - 0.06 * rise.value }] }));\n<Animated.View style={[styles.screen, stepStyle]}>{rail}</Animated.View>\n// after: the same, on a layer of its own (React Native Web passes willChange through)\nconst LAYER = Platform.OS === 'web' ? { willChange: 'transform' } : null;\n<Animated.View style={[styles.screen, LAYER, stepStyle]}>{rail}</Animated.View>\n```",
  "title": "A large view scaled by Reanimated on the web was redrawn at every scale: will-change transform lets Chrome scale it",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-62MG",
  "version": 1,
  "why": "Reanimated on the web writes the transform each frame, and Chrome drew the rail screen (14 pieces, each a stack of pictures turned in 3D) again at each new scale."
}