[Byamarro]

Webgl is tho. But even in 2d context api, you have bigger control over how your content is being printed than in html. Which means that a lot of operations that DOM performs unnecessarily in the context of Google docs can be simply discarded.

[bayesian_horse]

Yes, which is why in general, DOM rendering is faster, while in special cases, with a lot of manual optimization, canvas rendering is more performant.