[Bug 1959747]

[Mozilla-c]

> Perhaps it's not actually realted to webrender, I just assumed that because disabling it solved problems in the past. 
+1. Webrender on/off does not matter here at all. 

Maybe also worth mentioning:
I am on a 10th gen Intel GPU with 6.0.9-zen1-1-zen kernel


Boring workaround:

Switch to classic view and move the reading pane up until the message
list is snappy enough

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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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