https://bugs.kde.org/show_bug.cgi?id=499981
Bug ID: 499981
Summary: Mirroring screen cause reduced performance in Wayland
Classification: Plasma
Product: kwin
Version: git-stable-Plasma/6.3
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: xrandr
Assignee: kwin-bugs-n...@kde.org
Reporter: a1r...@a1rm4x.com
Target Milestone: ---
Mirroring the main screen causes measurable reduced performance in Wayland. The
issue is not reproducible in X11.
STEPS TO REPRODUCE
1. Plug a second screen output
2. Mirror screen output by replicating screen in the display configuration
OBSERVED RESULT
Reduce performance in a native game benchmark : Shadow of the Tomb Raider
Around 4%
EXPECTED RESULT
No impact on performance. In X11, there is no performance impact at all.
SOFTWARE/OS VERSIONS
Arch Linux/KDE Plasma:
KDE Plasma Version: 6.3
KDE Frameworks Version: 6.10
Qt Version: 6.8.2
Full example here: https://youtu.be/cBR7ogYafpg
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