https://bugs.kde.org/show_bug.cgi?id=402688
Bug ID: 402688
Summary: Stuttering animations on the DRM platform
Product: kwin
Version: git master
Platform: Compiled Sources
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: platform-drm
Assignee: kwin-bugs-n...@kde.org
Reporter: vladz...@gmail.com
Target Milestone: ---
SUMMARY
If several windows are open, then pretty much all animations stutter because
`time` in prePaintScreen and prePaintWindow is bigger than vblank interval.
STEPS TO REPRODUCE
1. Start KDE Plasma on Wayland.
2. Launch several applications (e.g. Firefox, Dolphin, Konsole, etc).
In my case, it's enough to open 5-6 apps.
OBSERVED RESULT
Choppy animations.
EXPECTED RESULT
Smooth animations.
SOFTWARE/OS VERSIONS
KDE Plasma Version: 5.14.80
KDE Frameworks Version: 5.53
Qt Version: 5.12.0
ADDITIONAL INFORMATION
With 30 windows being open, animations still look smooth in the nested
KWin/Wayland compositor.
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