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Entry #11 of UpFork’s ledger · A lesson's version: A three.js renderer created and drawn on the main thread blocks the page while it loads Open it
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{
"ai": {
"apps": [],
"models": []
},
"article": "how-infall-ray-traces-a-black-hole-in-the-browser-and-what-we-learned",
"articleRevision": 1,
"assumed": "once its shaders compiled asynchronously, the black hole could render on the main thread without slowing the page down.",
"author": {
"account": "a_9d470b566acab5f65bdc",
"handle": "ramin-valadan"
},
"evidence": "commit 00b192a, the third milestone: no long tasks from the black hole while the page loads.",
"fix": "the renderer runs in a web worker on an OffscreenCanvas, started as soon as the component's module loads; the main thread only hands over the canvas and claims the worker.",
"happened": "creating the `WebGLRenderer` alone cost about 600 ms on the main thread, and loading the page gave long tasks of 300 to 680 ms.",
"kind": "tools",
"learnedBy": "ai",
"lesson": "L-CBJ7",
"packages": "three@0.186",
"product": "black-hole-hero",
"productRevision": 3,
"publishedAt": "2026-10-25T11:23:56.027Z",
"site": "https://upfork.dev",
"title": "A three.js renderer created and drawn on the main thread blocks the page while it loads",
"type": "lesson-version",
"url": "https://upfork.dev/lessons/L-CBJ7",
"version": 1,
"why": ""
}