https://bugs.kde.org/show_bug.cgi?id=419187
Bug ID: 419187
Summary: Kwin High CPU usage when notification arrives
Product: kwin
Version: 5.18.3
Platform: Neon Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: platform-x11-standalone
Assignee: kwin-bugs-n...@kde.org
Reporter: whew-...@outlook.com
Target Milestone: ---
SUMMARY
When a notification pops up, kwin_x11 uses up to 90% of the CPU for a few
seconds.
STEPS TO REPRODUCE
1. Enter command "notify-send anything" in Konsole
OBSERVED RESULT
Notification pops up. Whole system lags for a second or two, and kwin spikes to
around 90% CPU usage in that time.
EXPECTED RESULT
A notification without the lag.
SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.18
KDE Plasma Version: 5.18.3
KDE Frameworks Version: 5.68.0
Qt Version: 5.14.1
Kernel Version: 5.3.0-42-generic
OS Type: 64-bit
Processors: 16 × AMD Ryzen 7 2700X Eight-Core Processor
Memory: 15.6 GiB of RAM
Nvidia Proprietary driver version 435.21
GTX 1070
ADDITIONAL INFORMATION
Especially annoying when playing a game, because in-game the fps drops down to
like 5-10fps during the high cpu usage.
Telegram and Discord notifications are no exception.
Switching to XRender backend seems to nearly eliminate the lag, but it's still
noticeable for less than a second, and there seems to be no usage spike.
OpenGL 2.0 makes kwin_x11 spike to around 70%
OpenGL 3.1 makes kwin_x11 spike to around 90%
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