(In reply to Sebastian from comment #40)
> I am having the same issue with ~25% CPU usage when hovering over the 
> messages list and from what I can observer this is somehow related to the 
> HiDPI monitor I am using (27' LG, 4k)?
> 
> OS: Fedora 37
> TB: 102.9.1
> Nvidia 3060Ti + X11 (Also tested this with an AMD RX 580 and X11 and Wayland 
> - same issue)
> Ryzen 5 3400G (4 cores/8 threads)
> 16G Memory
> 
> Also recorded a profile: https://share.firefox.dev/3MNOpmA

nsTreeBodyFrame::PaintCell
nsTreeBodyFrame::PaintImage
nsMsgDBView::GetCellProperties

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to thunderbird in Ubuntu.
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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