Bug 502079

Summary:	KWIN using upwards of 80% CPU
Product:	[Plasma] kwin	Reporter:	Amilie B <amilie>
Component:	performance	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED WORKSFORME
Severity:	normal	CC:	amilie, john.kizer
Priority:	NOR
Version First Reported In:	6.3.3
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	HTOP - Kwin Screenshot (81% Usage)

Description Amilie B 2025-03-27 16:14:36 UTC

Created attachment 179789 [details]
HTOP - Kwin Screenshot (81% Usage)

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SUMMARY
KWIN uses more than 80% of CPU at all times, causing lag on all apps and the session becoming unusable resulting in a need to restart Plasma.

STEPS TO REPRODUCE
1. Load KDE
2. Open applications and use system as usual.
3. Observe in System Monitor / HTOP / BTOP as KWIN usage rises drastically.

OBSERVED RESULT
CPU usage rises above 80% for KWIN.

EXPECTED RESULT
KWIN intended to use a less extreme amount of CPU as it lags other software.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux KDE Plasma Wayland
KDE Plasma Version: 6.3.3
KDE Frameworks Version: 6.12.0
Qt Version: 6.8.2

ADDITIONAL INFORMATION

Comment 1 John Kizer 2025-04-09 18:16:21 UTC

Hi - could you please provide a bit more information about what you're seeing:

* What is your graphics card situation - Intel/AMD/NVIDIA, driver version if applicable?
* Does this issue begin as soon as the system starts, or does it start normally and then increase CPU usage with each open window?
* Does the issue remain when the system is idle for a while?
* Does CPU usage decrease if you close all applications, or does it stay stuck at a high usage level?

(Thinking this may be connected to the underlying issues in https://bugs.kde.org/show_bug.cgi?id=486214 )

Thanks!

Comment 2 Bug Janitor Service 2025-04-24 03:47:30 UTC

🐛🧹 ⚠️ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME.

For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging.

Thank you for helping us make KDE software even better for everyone!

Comment 3 Bug Janitor Service 2025-05-09 03:46:42 UTC

🐛🧹 This bug has been in NEEDSINFO status with no change for at least 30 days. Closing as RESOLVED WORKSFORME.