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Entry #142 of UpFork’s ledger · A lesson's version: Windows that scale and turn as they fly stalled the browser's rendering: cache each as a layer only while it flies Open it
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{
"ai": {
"apps": [
"Claude"
],
"models": [
"Claude Opus 5.5"
]
},
"article": "draggable-windows-at-60-fps-in-react-media-folder-s-compositor-only-drag-and",
"articleRevision": 1,
"assumed": "windows animated with transforms would be composited, and cost nothing to draw as they moved.",
"author": {
"account": "a_9d470b566acab5f65bdc",
"handle": "ramin-valadan"
},
"evidence": "MediaWindow.tsx lines 122–133; useVisibilityPlayback.ts line 48.",
"fix": "while a window flies it carries `data-moving`, which sets `will-change: transform` (so it moves as one cached bitmap) and drops the title bar's blur; both come back when it lands. Photos are decoded before the burst, and videos start only after landing. Closing and reopening then ran with a worst frame gap of about 40 ms. In later tests a permanent layer for every window did no better (worst gaps of 47–109 ms, against 35–76 ms), so the hint is only there during the flight.",
"happened": "the browser kept drawing each window's content again as its scale and angle changed. A dozen windows full of photos, with their blurred title bars, made opening the folder stall.",
"kind": "my-mistake",
"learnedBy": "ai",
"lesson": "L-RCHQ",
"packages": "",
"product": "macos-folder-draggable-windows-react",
"productRevision": 1,
"publishedAt": "2026-10-26T10:56:31.995Z",
"site": "https://upfork.dev",
"title": "Windows that scale and turn as they fly stalled the browser's rendering: cache each as a layer only while it flies",
"type": "lesson-version",
"url": "https://upfork.dev/lessons/L-RCHQ",
"version": 1,
"why": ""
}