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Recorded on 26 October 2026, unchanged since

Entry #149 of UpFork’s ledger · A lesson's version: A pointer spotlight painted from CSS variables repaints the whole stage on every move: move a fixed disc instead Open it

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Recorded: 26 Oct 2026, 11:26 UTC
Signed with: k1 · Ed25519
Entry hash: 0f7b8221e4fd5045fe2e5a8768d5c98a12735b2bc91672c1a3350fe8649cffda
Before it: 68243c6541a0bad36ea861979ee4de589fbfe94784b2cb769d7eac3935c44035
Record hash: 2a660218b07cb16fa139de1b39f0be309322199edc8d03512183d98fc9c40834
Signature: NYmbyKU3zdsbKo4jN2JgQueVLEdRdwgoVb4W+eaU78/0eOWgasx21uSps3hT4xFrwsoeVBsv0lsRE9tuC/QNAw==

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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "article": "commander-a-pointer-following-mascot-hero-from-90-video-frames-and-eight-tra",
  "articleRevision": 1,
  "assumed": "a soft light following the pointer was cheap as a full-stage radial gradient whose centre came from CSS variables set on the hero.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "HeroStage.tsx lines 241–242; commander-hero.css lines 187–196 and 321–325; commit d4ec4b9.",
  "fix": "the spotlight is a fixed soft disc that the stage moves with `transform`, so following the pointer neither restyles nor repaints; and nothing over the canvas uses a backdrop blur: borders are gradient rings instead. The head then ran at a steady 60 fps, p95 16.8 ms, with real pointer events.",
  "happened": "measured with real pointer events on an Intel Iris Plus laptop, every pointer move repainted that full-stage gradient, and the frosted (`backdrop-filter`) panels in the copy layer, which shifts slightly with the pointer, blurred their backdrop again every frame.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-NRFC",
  "packages": "",
  "product": "pet-shop-hero",
  "productRevision": 2,
  "publishedAt": "2026-10-26T11:25:38.396Z",
  "site": "https://upfork.dev",
  "title": "A pointer spotlight painted from CSS variables repaints the whole stage on every move: move a fixed disc instead",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-NRFC",
  "version": 1,
  "why": ""
}