https://bugs.kde.org/show_bug.cgi?id=396345
Bug ID: 396345
Summary: high cpu activity after upgrade from 5.12 to 5.13
Product: kwin
Version: 5.13.2
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: terragonj...@yahoo.com
Target Milestone: ---
After my last system upgrade (debian sid) I've noticed a large increase in cpu
activity by kwin. It seems to be related to the number of windows open. With,
let's say, 30 windows open with kwin 5.12 I would see a steady 6 to 8 % cpu
activity. Under the same exact conditions (not only the same number of windows
but the very same set of windows) with kwin 5.13.2 I see a steady 36 to over 40
% cpu activity.
To isolate the problem, I've re-upgraded my system but this time I've kept
plasma 5.12 (and all the rest of kde stack: kf 5.46 etc). And the cpu activity
is the usual 6 to 8%. So it does seem to be a problem related with kde and not
with other software involved in the system upgrade (say, some part of x.org).
Is there maybe some new effect or something in plasma 5.13 that wasn't there in
5.12 and that I can try to disable to see if it's the culprit?
I'm using the opengl 2 backend. With opengl 3 it doesn't get any better. With
Xrender it goes back to 6% cpu usage but of course it's not really smooth...
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