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The demos look great! I imagine it's not pure javascript. Are you using webgpu?

The WebGL API is based on the OpenGL ES standard, which jettisoned a lot of the procedural pipeline calls that made it easy to write CPU-bound 3D logic.

The tradeoff is initial complexity (your "hello world" for WebGL showing one object will include a shader and priming data arrays for that shader), but as consequence of design the API sort of forces more computation into the GPU layer, so the fact JavaScript is driving it matters very little.

THREE.js adds a nice layer of abstraction atop that metal.

Spark allows you to construct compute graphs at runtime in Javascript and have them compiled and run on the GPU and not be bound by the CPU: https://sparkjs.dev/docs/dyno-overview/

WebGL2 isn't the best graphics API, but it allows anyone to write Javascript code to harness the GPU for compute and rendering, and run on pretty much any device via the web browser. That's pretty amazing IMO!

Just WebGL2

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