[Bug 1959747]

[Seb45tian]

I tried to narrow this down a bit and made tests with several versions
including beta releases. For me the problem starts when switching from

**88.0b3** (snappy, fast)
to
**89.0b1** (slow, high cpu usage)

I was trying to build a version for all the commits (revisions in
mecurial?) in between to narrow it down further but was only successful
for the latest 115 version so far. I'll keep trying, though.  If someone
could confirm, that the "laggyness" was introduced in between those
versions, this would already be quite helpful. Archived releases can be
found here: https://archive.mozilla.org/pub/thunderbird/releases/

And if someone is more familiar with building Thunderbird and mercurial
(hg) version control, maybe he/she can help out building the revisions
in between those releases?

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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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