[Bug 1959747]

[Mw-c]

(In reply to Fabian Rodriguez:MagicFab from comment #13)
> I see at least two reports confirming this in Mozilla Thunderbird support, including Windows, Mac and GNU/Linux - and I have the same problem (TB 91.1.2 on Windows 10). 
> 
> This makes Thunderbird slow to the point it can't be used normally.
> 
> A possible workaround was mentioned here : 
> https://support.mozilla.org/en-US/questions/1347196#answer-1435915
> 
> > If I go to preferences --> config editor and search for the entries:
> > 
> >    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 suggest raising importance/severity. People upgrading seldom backup their Thunderbird profile and when this happens, all the usual "Thunderbird is slow" are being tried without a solution, bringing a user closer to stop using Thunderbird and go to other options.
> 
> A few references to people reporting this problem :
> 
> * https://support.mozilla.org/en-US/questions/1347196
> * https://support.mozilla.org/en-US/questions/1351874

The mentioned parameter (gfx...force-disabled) is gone from
configuration in 102 . Reinstating the parm helps some but doesn't fix
the 100% CPU utilization. (5.15.0-52-generic #58~20.04.1-Ubuntu SMP on
Intel Core i7-2760QM)

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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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