https://bugs.kde.org/show_bug.cgi?id=499911
Bug ID: 499911
Summary: Visual effects very slow with an external monitor
Classification: Plasma
Product: kwin
Version: 6.2.5
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: multi-screen
Assignee: kwin-bugs-n...@kde.org
Reporter: g...@marcais.net
Target Milestone: ---
SUMMARY
When an external monitor (4k) is plugged-in with HDMI or usb dock, the desktop
animations (e.g., shifting between virtual desktops, alt-tabe between windows,
overview) can become very slow and choppy. Sometimes it is so slow has becoming
difficult to use the desktop (say >1s to show overview).
When using Zoom on the browser (firefox), the slowness is even worse. No such
slowness when using Zoom on the built-in screen.
STEPS TO REPRODUCE
1. Plug-in external monitor
2. Play around, open windows
3. Launch overview
OBSERVED RESULT
If overview has not been used in a while, it might be very slow (say take >
1s).
EXPECTED RESULT
No noticeable slow down should be observed, as in the case without an external
monitor.
SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 41
KDE Plasma Version: 6.2.5
KDE Frameworks Version: 6.10.0
Qt Version: 6.8.2
Kernel Version: 6.13.2-cachyos1.fc41.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 8 × 11th Gen Intel® Core™ i7-11390H @ 3.40GHz
Memory: 15.4 GiB of RAM
Graphics Processor: Mesa Intel® Iris® Xe Graphics
ADDITIONAL INFORMATION
Built-in screen: 1920x1080@60Hz, scale 100%
External monitor: Samsung U32J59x 3840x2160@60Hz, scale 120%
This slow behavior was also observed with Dell monitors (4k@30Hz).
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