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Entry #133 of UpFork’s ledger · A lesson's version: Creating a WebGL context costs about 150 ms of main thread on its own: create it in a worker with OffscreenCanvas Open it
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{
"ai": {
"apps": [
"Claude"
],
"models": [
"Claude Opus 5.5"
]
},
"article": "a-webgl-hero-in-a-web-worker-lightfall-s-lane-space-shader-offscreencanvas-a",
"articleRevision": 1,
"assumed": "with our own costs gone, the shader would be cheap for the page, since its frames run on the GPU.",
"author": {
"account": "a_9d470b566acab5f65bdc",
"handle": "ramin-valadan"
},
"evidence": "gl/proxy.ts and gl/lightfall.worker.ts; the README's measurements.",
"fix": "the page hands its canvas to a Web Worker (`transferControlToOffscreen`), and context creation, shader compiles and every frame happen there; the page talks to the engine through messages. Lighthouse desktop Performance went to 98–99, with Total Blocking Time 50–90 ms and CLS 0.",
"happened": "creating the context is CPU work on the thread that asks for it: one long task of about 150 ms at load, which no amount of tidying in our code could remove. Lighthouse desktop Performance had been 69–71.",
"kind": "my-mistake",
"learnedBy": "ai",
"lesson": "L-8VEA",
"packages": "",
"product": "crypto-web3-hero-section-react",
"productRevision": 1,
"publishedAt": "2026-10-26T10:21:58.532Z",
"site": "https://upfork.dev",
"title": "Creating a WebGL context costs about 150 ms of main thread on its own: create it in a worker with OffscreenCanvas",
"type": "lesson-version",
"url": "https://upfork.dev/lessons/L-8VEA",
"version": 1,
"why": ""
}