https://bugs.kde.org/show_bug.cgi?id=490693
Bug ID: 490693
Summary: Visible stutter when dragging objects.
Classification: Plasma
Product: kwin
Version: 6.1.3
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: performance
Assignee: kwin-bugs-n...@kde.org
Reporter: karo...@gmail.com
Target Milestone: ---
SUMMARY
I am not sure if this is a bug in KWin, or Plasma etc - please reassign the
product if I made a mistake.
Dragging icons and other objects with a mouse causes a lot of stutter and high
CPU usage in Xorg process.
I think it started happening in Plasma 6.1.0.
STEPS TO REPRODUCE
1. Click and drag an icon from a task bar; it also happens when you drag e.g a
clickable link in a browser.
2. Similar, although slightly less visible effect is when moving the mouse
cursor over the task manager icons, mouse cursor kind of slows down and starts
to stutter, when it is outside the toolbar it moves smoothly again. It also
causes 98% CPU usage.
OBSERVED RESULT
Xorg process CPU usage jumps to 98%, there is a visible system slowdown,
dragged icon or link moves with a visible stutter.
EXPECTED RESULT
There is no CPU usage hike, dragged object and cursor moves smoothly.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 40
KDE Plasma Version: 6.1.3
KDE Frameworks Version: 6.4.0
Qt Version: 6.7.2
NVidia Driver: 550.67
ADDITIONAL INFORMATION
See attached video: https://photos.app.goo.gl/SGV5jbhbi5fdRgva8
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