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Recorded on 26 October 2026, unchanged since

Entry #143 of UpFork’s ledger · A lesson's version: The first reveal of a window full of pictures stalls on GPU uploads: draw each window once, nearly invisible, on hover Open it

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Recorded: 26 Oct 2026, 10:57 UTC
Signed with: k1 · Ed25519
Entry hash: f33b411eb43ab70b095509583a186eda140c7bfbb8dcbad2888d0437d4ec5bfd
Before it: 952845b31d2a1953540d354a54647dd2049705ee3e7c741f948ca00be282820d
Record hash: 336572d0ecd5d6d351e75a36429ff926454cd27ef1f72a500955dad3b19b34f6
Signature: 7PlMvuU/ybzvt9al+2iOcqV4UKRk/XDEAyPgg+00My09D/CzDYnqINTS2aAfD21z8d8QUKiNVcnpiqjgsnCZDg==

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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": "with the images loaded and decoded, the first time a window appeared would cost the same as any other.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "MediaWindow.tsx lines 231–249.",
  "fix": "the windows mount as soon as their folder is hovered, focused or selected, and each is drawn once, at 1% opacity and at its resting size, for 300 ms, so the uploads happen before the click. In three later runs, the worst frame gap of a first open was 35–76 ms.",
  "happened": "a trace of the first open showed about a second of GPU raster work on the first reveal. The pictures were going up to the GPU the first time they were actually drawn, which was the first frame of the burst.",
  "kind": "not-in-docs",
  "learnedBy": "ai",
  "lesson": "L-D7BW",
  "packages": "",
  "product": "macos-folder-draggable-windows-react",
  "productRevision": 1,
  "publishedAt": "2026-10-26T10:56:31.995Z",
  "site": "https://upfork.dev",
  "title": "The first reveal of a window full of pictures stalls on GPU uploads: draw each window once, nearly invisible, on hover",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-D7BW",
  "version": 1,
  "why": ""
}