Thanks for the bug report. In your video I can see two causes that are
not really bugs:
* Firefox using CPU at the same time as gnome-shell means it is Firefox
causing the persistent CPU usage in gnome-shell. Make sure Firefox isn't
displaying animations like web ads. Even if that doesn't look like the
problem, it's still Firefox's fault if the problem is correlated with
that app running.
* Triggering the window spread animation causes even higher gnome-shell
CPU usage. This is normal and not a bug. Although we welcome patches to
make it more efficient.
Suggested workaround: Make Firefox render more efficiently by adding
MOZ_ENABLE_WAYLAND=1 to /etc/environment and then reboot. Also don't
leave any browser tabs open that you don't need.
** Changed in: gnome-shell (Ubuntu)
Status: New => Opinion
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https://bugs.launchpad.net/bugs/1999578
Title:
Bursts of high CPU usage after triggering overview
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