[Bug 1959747]

[Frank Winklmeier]

In my case, I have no add-ons installed and tested with an clean
profile. Compared to Thunderbird 91 the UI is laggy and uses about a
factor 2 more CPU when hovering over the entries in the message pane.

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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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