> it apparently doesn't finish rendering at all What's happening here is the browser did a first paint, and then the javascript started eating up all the CPU.

> it apparently doesn't finish rendering at all What's happening here is the browser did a first paint, and then the javascript started eating up all the CPU. You can scroll because of asynchronous pan/zoom, but when you get to the edge of the rendered region, it asks to render more and it never gets rendered because the page is stuck executing javascript. Recording: https://share.firefox.dev/3C2DE9C https://share.firefox.dev/3C2DE9C