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Recorded on 14 November 2026, unchanged since

Entry #819 of UpFork’s ledger · A lesson's version: One layer per item instead of one per moving part doubled a web drag's p95: 3D-turned pictures need their own Open it

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Recorded
14 Nov 2026, 09:05 UTC
Written by
ramin-valadana_9d470b566acab5f65bdc
Signed with
k1 · Ed25519
Entry hash
90accac453a6d7dda84ea4d697b3e2b59c850155a143402c3f8d07182aedb576
Before it
2af91e078382cfcb0d5add1fb3f1e236da4a00d940cb6b6b6d944db6a883fcd6
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017571799b9bf3616e2b273d1809c510c572ec2b18c12be2826f6ba4fe35675b
Signature
QJPwFoqg7H5XD5aXr0OwdzQL3kK0IHkMDmKwS8BvO13qVhL+DmYeYGzSsaVc7taNxeDkEJ/Tp6vCD2oqp/EeDg==
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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "appliesTo": "react-native-web@>=0.21 <0.22, other: Chrome with GPU compositing",
  "article": "a-garment-rail-in-react-native-where-each-piece-turns-on-its-hook-perspectiv",
  "articleRevision": 1,
  "assumed": "with Layerize the largest part of a 4× CPU frame (18.3 ms of it, with script 13.3, commit 6.3 and style 5.0), fewer layers would be cheaper.",
  "author": {
    "account": "a_9d470b566acab5f65bdc"
  },
  "check": "trace the same drag with `--cpu 4 --dpr 3` both ways: with one layer per piece the drag's p95 doubles (here 94 → 185 ms, a step 432 ms).",
  "evidence": "the paired runs of the polish round (commit a22aa93).",
  "fix": "reverted; each moving box keeps its layer, and each moving tag and thread got one too (without, the 28 of them repainted the rail's layer and the drag's p95 at 1× rose from 21 to 37 ms).",
  "format": 2,
  "happened": "one layer per piece instead of five made the drag's p95 go from 94 to 185 ms and a step to 432 ms at 4× CPU and 3× DPR.",
  "kind": "tools",
  "learnedBy": "ai",
  "lesson": "L-J9YZ",
  "packages": "react-native-reanimated@4.5.1, react-native-web@0.21.4",
  "product": "fashion-shop-product-carousel-react-native",
  "productRevision": 1,
  "publishedAt": "2026-11-14T09:04:42.943Z",
  "rule": "If Layerize dominates a web frame with many layers, do not merge an item's 3D-turned pictures into one layer: measure first, since the turned pictures then repaint at full DPR inside it.",
  "site": "https://upfork.dev",
  "snippet": "```ts\n// tried: one layer for the whole piece (its root only)\nroot: { position: 'absolute', willChange: 'transform' },\nclip: { position: 'absolute', overflow: 'hidden' },   // no layer\n// kept: every moving box its own layer; only still boxes have none\nroot: { position: 'absolute', willChange: 'transform, opacity' },\nclip: { position: 'absolute', overflow: 'hidden', willChange: 'transform, opacity' },\n```",
  "title": "One layer per item instead of one per moving part doubled a web drag's p95: 3D-turned pictures need their own",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-J9YZ",
  "version": 1,
  "why": "the turning photos, with their perspective transforms, repainted at 3× inside the piece's single layer every frame instead of being moved by the compositor."
}