The implementation shown in the video is actually particularly slow because all the geometric transformations are implemented in terms of lenses/optics ([1]) and ramdajs ([2]). So the whole mess is a gigantic stack of nested, composed and curried functions, instead of raw linear algebra (just becaus I could).

I later optimized the hotpath and it is significantly faster (still miles behind webgl/webgpu obviously). You can try yourself if you scroll alll the way to the veeeerrrry bottom here [3].

[1]: https://github.com/calmm-js/partial.lenses [2]: https://ramdajs.com/ [3]: https://static.laszlokorte.de/svatom/