Comment 67 for bug 1959747

With these settings reverted back to normal

> gfx.webrender.all
> gfx.webrender.force-disabled
>
> Switch the first one to false (it was already switched to false) and the second one to true (I switched this one manually)
> everything works smooths and no cpu usage jumps happen.

I can still reproduce unusual high CPU usage. There is no perceptible lag, but CPU usage still jumps to about 75 % on my end. To compare, continuous scrolling of websites in Firefox, even complex ones, consumes less than 25 % of CPU.

So, the claim “behave much better” might be true, but the mouse-over effect still seems excessively wasteful of resources.