https://bugs.kde.org/show_bug.cgi?id=360137
Bug ID: 360137
Summary: Low performance when moving mouse cursor over task
manager tabs in panel
Product: kwin
Version: 5.5.95
Platform: Exherbo Packages
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: li...@bernd-steinhauser.de
Since 5.5.95, I've noticed that moving the mouse cursor over the window tabs in
the task manager in the panel leads to temporary performance spikes. The
severity varies, sometimes it can be noticed that the cursor jumps for 1 to 1.5
seconds, sometimes it can barely be noticed.
There are two panels in my Plasma setup, both have a default panel layout. The
option to show the window tooltips have been deactivated for both task
managers.
The performance spikes are visible in the fps monitor, thus I'm sure they don't
just affect the cursor, but the whole desktop (and therefore I think it's
either a bug in kwin or the driver).
One interesting observation is that the effect is barely noticeable (but still
slightly present) with the EGL interface, but strongly present with the GLX
interface, which I didn't expect.
I switched back and forth a couple and found it to be reproducible.
With 5.5.4 and below I cannot remember ever seeing an effect like this.
Reproducible: Always
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