https://bugs.kde.org/show_bug.cgi?id=493450
Bug ID: 493450
Summary: Framerate briefly drops from 60 FPS to ~30 FPS on KDE
Plasma / Wayland
Classification: Plasma
Product: kwin
Version: 6.1.4
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: performance
Assignee: kwin-bugs-n...@kde.org
Reporter: nullit...@proton.me
Target Milestone: ---
Created attachment 173941
--> https://bugs.kde.org/attachment.cgi?id=173941&action=edit
KWin performance data - logging in without Show FPS effect
I’ve been getting framerate drops on KDE Plasma from 60 FPS to ~30 FPS. The
problem usually goes away after entering the desktop overview or changing
applications. I enabled the “Show FPS” Desktop Effect in settings to monitor
the drops, and with that on the screen the problem completely goes away.
However it does mean I have something always on my screen which I don't want.
Information about my setup:
- Arch Linux
- KDE Plasma 6 (6.1.4)
- Wayland
- Nvidia GeForce RTX 4070 (nvidia-open 560.35.03)
- HiDPI DisplayPort monitor
- ICC profile enabled for color correction
Steps to reproduce:
- Log in
- Perform an action such as holding down the up arrow to go through command
history in Konsole
KWin framerate drops noticeably with subsequent actions like scrolling,
dragging around the window, or showing the Dock at the bottom. As far as I can
tell, other things like video playback and gaming remain unaffected.
KWin performance data for without the Show FPS effect is attached). I also have
one for with the Show FPS effect but it looks like I can only attach a single
file. If there's a way I can attach that one as well do let me know.
Also worth noting is that I tried setting
`KWIN_DRM_DISABLE_BUFFER_READABILITY_CHECKS=1` which changed the behavior of
the problem from low framerates to flickering of updated areas on the screen.
Just like before, the problem went away with the "Show FPS" Desktop Effect
enabled.
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