https://bugs.kde.org/show_bug.cgi?id=489342
Bug ID: 489342
Summary: Desktop frame rate drops when fractional scaling is
enabled on wayland with a maximised Firefox window in
focus.
Classification: Plasma
Product: kwin
Version: 6.1.1
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: performance
Assignee: kwin-bugs-n...@kde.org
Reporter: nerig18...@dcbin.com
Target Milestone: ---
SUMMARY
When I open and maximise a Firefox window in wayland, while fractional scaling
is enabled, desktop animations have dropped frames. Animations such as
minimising and maximising other windows, opening and closing start menu,
opening new application windows and such.
STEPS TO REPRODUCE
1. Enable fractional scaling to any % on wayland
2. Open Firefox, maximise it and make sure no other window is in front or in
focus.
3. Open and close start menu or do anything else that has a desktop animation.
OBSERVED RESULT
Animations seem to have dropped frames / are laggy.
EXPECTED RESULT
Animations are smooth.
SOFTWARE/OS VERSIONS
OS: Arch Linux
KDE Plasma Version: 6.1.1
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.2
ADDITIONAL INFORMATION
Occurs on other distros that I have tried on USB.
Does not occur with scaling at 100%
Does not occur in X11 with or without fractional scaling.
If another window is in front of Firefox (FF is not in focus) the animations
are smooth as expected.
Does not occur if FF is windowed / not maximised
If you set FF to work under Xwayland instead, the bug does not occur.
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