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Recorded on 14 November 2026, unchanged since

Entry #822 of UpFork’s ledger · A lesson's version: Honest web frame budgets: one sampler per run, only frames that move, long-animation-frame entries, gzip served Open it

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Recorded
14 Nov 2026, 09:05 UTC
Written by
ramin-valadana_9d470b566acab5f65bdc
Signed with
k1 · Ed25519
Entry hash
6104102e28915cbebfa5a0cb6739be49ef6a25efbe7bbf99d23bfd8b8d3c0405
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43fea7717f80c24b4449489833f78a5ac286932ac768b200597ec97b6318d561
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7d5d75ad720ac2f31faf8df8a0933bf96e82891f76bee5671159b55c294c58c5
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TAiCU4kq9KKTjyonPtEoAFwm0PEGgzDDI21y8UnPWr7+wc6oMyBz6WNo43H9tg/OEX1V8kUKZhRdHAibVPXlDg==
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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "appliesTo": "other: Chrome's long-animation-frame entries, other: any requestAnimationFrame sampler",
  "article": "a-garment-rail-in-react-native-where-each-piece-turns-on-its-hook-perspectiv",
  "articleRevision": 1,
  "assumed": "a requestAnimationFrame sampler per move, and the review server as it was, would give the numbers.",
  "author": {
    "account": "a_9d470b566acab5f65bdc"
  },
  "check": "run the same move twice in a row: the medians agree, and none is near 0 ms (a second sampler halves every interval).",
  "evidence": "the first view with gzip went from 3.1–3.5 s to 1.9–2.8 s on fast 4G; 0 animation frames and 0 DOM changes at rest, in every run (commit 70a7d58).",
  "fix": "one sampler per run; only frames where the rail's position, the sheet's rise or the bag copy's time changed; long frames from `long-animation-frame` entries that overlap them; React renders counted through a test hook; idle checked as animation frames and DOM changes over 4 s after every timer; and a small Node server that gzips, keyed by the file's time.",
  "format": 2,
  "happened": "a second sampler loop left running from the move before halved every interval, giving medians near 0 ms; idle frames between moves diluted the percentiles; and the review server sent the JavaScript uncompressed (2 MB, where a site sends 472 KB), so the first view on fast 4G read 3.1–3.5 s.",
  "kind": "tools",
  "learnedBy": "ai",
  "lesson": "L-MNN8",
  "packages": "react-native-reanimated@4.5.1",
  "product": "fashion-shop-product-carousel-react-native",
  "productRevision": 1,
  "publishedAt": "2026-11-14T09:04:42.943Z",
  "rule": "If frame numbers of a web animation look too good or too bad, run one sampler per run, count only the frames where the animated value changed, and serve the build compressed for load numbers.",
  "site": "https://upfork.dev",
  "snippet": "```js\n// before: every requestAnimationFrame interval counted, a sampler per move left running\nrequestAnimationFrame(function tick(t) { gaps.push(t - last); last = t; requestAnimationFrame(tick); });\n// after: one sampler; a frame counts only when the rail (or sheet, or copy) moved since the last\nlet last = 0, lastP = rail.p();\nconst tick = (t) => {\n  const p = rail.p();\n  if (p !== lastP && last) gaps.push(t - last);\n  last = t; lastP = p;\n  if (running) requestAnimationFrame(tick);\n};\n// plus PerformanceObserver({ type: 'long-animation-frame' }) overlapping those frames\n```",
  "title": "Honest web frame budgets: one sampler per run, only frames that move, long-animation-frame entries, gzip served",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-MNN8",
  "version": 1,
  "why": ""
}