[Bug 1959747]

[1-geoff]

Not to me, but it might to some GFX people. Although they'd probably
prefer a more recent profile.

(In reply to Sebastian from comment #56)
> This helped, thank you! I was able to narrow it down a bit further to 
> ```
> 48:20.61 INFO: Last good revision: 036520a38d2b3d46fb31cf93f89d3545242feac5 (2021-01-27)
> 48:20.61 INFO: First bad revision: 0f4f1c5ca5d305dd600f759c69737e43478e6777 (2021-01-28)
> ```

These correspond to [these changes in mozilla-
central](https://hg.mozilla.org/mozilla-
central/pushloghtml?fromchange=42791e22621d1dab5fff576448eccb45f6b3ca6a&tochange=37557864a6845bb8068904e44e8a7dd16746d211).
Jamie and/or  Lee, would you have a look at the profile from comment 39
and see if you find anything interesting? (I'm picking on you because I
don't know any GFX people and you both made changes in the regression
range which might be related. Sorry!)

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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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