https://bugs.kde.org/show_bug.cgi?id=478331
Bug ID: 478331
Summary: Kwin performance tanks in gpu bound scenarios
Classification: Plasma
Product: kwin
Version: git master
Platform: Gentoo Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
STEPS TO REPRODUCE
1. Login to plasma wayland
2. Open any(?) game that will be gpu bound, ive personally tested Rocket League
(steam version, proton) and Risk of Rain 2 (steam, proton).
3. Ensure vsync is disabled, i've notice if vsync is on then kwin renders at
its intended framerate
OBSERVED RESULT
Kwin will render (based on the show fps desktop effect) at roughly half the
framerate of the game. For example, in Rocket League the game renders at about
~300 fps, then kwin will render at about 150. In Risk of Rain 2, the game will
run at about 135 fps and kwin will render at about 75. This has a very
noticeable impact on visual quality, as the framerate is being nearly halfed.
EXPECTED RESULT
Kwin should render at roughly the games framerate, which is what it does if i
enable vsync.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: gentoo / git master using kdesrc build
KDE Plasma Version: git master
KDE Frameworks Version: git master
Qt Version: 6.6.1 from gentoo packages
ADDITIONAL INFORMATION
Kwin wayland works as intended on version 5.27.10.
GPU: 5700xt, mesa git
CPU: 12900k
Monitor: 1440p 240hz LG 27GR95QE
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