[Bug 1959747]

[Completelyrandom+github]

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.

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https://bugs.launchpad.net/bugs/1959747

Title:
  [upstream] Very high CPU and slow responsiveness in Thunderbird 91-102

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