[Bug 1959747]

[Frank Winklmeier]

Thanks Wayne. I think the confusing part in this ticket is that there
must have been multiple regressions in terms of CPU over time and I
think we are also mixing X and Wayland (in case that matters). Certainly
I also saw a big slowdown between TB 91 and 102.

In any case, with regards to my specific problem (mouse hover lagging behind in Supernova) I narrowed it down to:
```
 2:47.23 INFO: Narrowed nightly regression window from [2023-01-18, 2023-01-20] (2 days) to [2023-01-18, 2023-01-19] (1 days) (~0 steps left)
 2:47.23 INFO: Got as far as we can go bisecting nightlies...
 2:47.23 INFO: Last good revision: 76f62fd3a78092592457e19dbc6e59f87c4f084d (2023-01-18)
 2:47.23 INFO: First bad revision: ac5c72f2e56036e2088b5aa794891978fcede5aa (2023-01-19)
 2:47.23 INFO: Pushlog:
https://hg.mozilla.org/comm-central/pushloghtml?fromchange=76f62fd3a78092592457e19dbc6e59f87c4f084d&tochange=ac5c72f2e56036e2088b5aa794891978fcede5aa
 [...]
 2:54.34 INFO: There are no build artifacts for these changesets (they are probably too old).
```
Visually the GUI changed drastically between these two builds (colors, icons, etc.) so I assume this is the massive "ash" code landing you mentioned?

-- 
You received this bug notification because you are a member of Mozilla
Bugs, which is subscribed to Mozilla Thunderbird.
https://bugs.launchpad.net/bugs/1959747

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

To manage notifications about this bug go to:
https://bugs.launchpad.net/thunderbird/+bug/1959747/+subscriptions