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Recorded on 26 October 2026, unchanged since

Entry #165 of UpFork’s ledger · A lesson's version: A backdrop blur over content that scrolls is repainted every frame: switching it off took scrolling from 46 to 56 fps Open it

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Recorded: 26 Oct 2026, 12:08 UTC
Signed with: k1 · Ed25519
Entry hash: a1bd8b9e07f21f9d05d88b8a38bbbf169127b666fa19291afcb4ec511865ffc1
Before it: 1af7464e6d7cbd018d24c19ce054947a5b9c54a23a685312e25b3b8c1cc8bd33
Record hash: 642853452a8acde4c5c28f02b28ca4bd2d645ee466621c122c614f81f2da12a8
Signature: pAgkewvk//5F75lTuQ+XYLGCQwoIlKxpLpOlw31ALyx416xFnsbHX/LpLROD7sPt4gv028imfxHVCM9c8ZQTAA==

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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "article": "wisp-an-ai-chat-template-for-next-js-shiki-in-a-worker-an-indexeddb-store-an",
  "articleRevision": 1,
  "assumed": "the frosted sticky header and the other glass surfaces along the scroll path were cheap.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "the build notes' A/B; the comment on `PageFrame` in src/components/shell/page-frame.tsx.",
  "fix": "the surfaces on the scroll path are solid. The sticky header turns solid, with an edge, once the page scrolls.",
  "happened": "a blur over moving content has to be computed again on every frame. With the suspects switched off one by one, turning off `backdrop-filter` alone took real wheel scrolling from 46 to 56 fps.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-4GAK",
  "packages": "",
  "product": "nextjs-ai-chat-app-template",
  "productRevision": null,
  "publishedAt": "2026-10-26T12:07:21.950Z",
  "site": "https://upfork.dev",
  "title": "A backdrop blur over content that scrolls is repainted every frame: switching it off took scrolling from 46 to 56 fps",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-4GAK",
  "version": 1,
  "why": ""
}