I just re-installed TB 115.6.0 from scratch on a completely new Laptop
(Lenovo Carbon X1 Gen 11) running Ubuntu 22.04 and I see exactly the
same behavior there as on my old laptop. I will have to revert to TB 91
as any newer version is essentially unusable for me.

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

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

Status in Mozilla Thunderbird:
  Confirmed
Status in thunderbird package in Ubuntu:
  Triaged

Bug description:
  Very high CPU and slow responsiveness in Thunderbird 91.5.0 and later.
  Just moving the mouse cursor over a message list results in 365% CPU
  for me.

  I had to set this in the config editor to fix it:

    gfx.webrender.force-disabled = TRUE

  Upstream bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1730423

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