https://bugs.kde.org/show_bug.cgi?id=360137
--- Comment #4 from Bernd Steinhauser <li...@bernd-steinhauser.de> ---
(In reply to Thomas Lübking from comment #3)
> > the cursor jumps for 1 to 1.5 seconds
> The cursor should be done in hardware and painted directly into the scanout
> buffer.
>
> Does any other item in the panel cause this?
Yeah, I noticed that especially items showing tooltips when hovering over them
show this behavior, but it's not as easy to notice because the area of those
widgets is small compared to the task manager.
Items I found to cause lag: Menu (currently kickoff), Desktop Switcher, Task
Manager and the panel settings symbol.
However, not all of them do. The systray does not seem to be affected and
neither is the clock.
I also don't notice this right away, it gets worse over time and after a couple
of hours there is a strong effect.
Right after (re-)starting plasma, everything looks normal.
So it looks more like it's a plasma bug. Theory: plasma temporarily consumes a
huge amount of cpu time which leads to kwin or X starting to lag for a short
time.
>
> Let's say I simply completely distrust QML.
> Please edit
> /usr/share/plasma/plasmoids/org.kde.plasma.taskmanager/contents/ui/main.qml
> and comment
>
> // toolTipItem: toolTipDelegate
>
> and
>
> // ToolTipDelegate {
> // id: toolTipDelegate
>
> // visible: false
> // }
>
> restart plasmashell and check again.
Nope, that didn't help. The task manager still behaves the same.
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