[Bug 1959747]

[Vseerror-i]

> Thanks Wayne. I think the confusing part in this ticket is that there
must have been multiple regressions in terms of CPU over time and I
think we are also mixing X and Wayland (in case that matters). Certainly
I also saw a big slowdown between TB 91 and 102.

Very possible.

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

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