Bug 480987

Summary:	Show FPS increases CPU usage of kwin_wayland by around 20%.
Product:	[Plasma] kwin	Reporter:	feature
Component:	effects-various	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED NOT A BUG
Severity:	minor	CC:	kde
Priority:	NOR	Keywords:	qt6
Version First Reported In:	master
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description feature 2024-02-07 06:37:43 UTC

SUMMARY
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***
Show FPS increases CPU usage of kwin_wayland by around 25%.

STEPS TO REPRODUCE
1. In settings select window management
2. Select Desktop effects
3. Enable Show FPS

OBSERVED RESULT
CPU usage increases by about 20%

EXPECTED RESULT
CPU usage should not noticeably increase.

SOFTWARE/OS VERSIONS

Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 6.0.80
KDE Frameworks Version: 6.0
Qt Version: 6.6.1

ADDITIONAL INFORMATION

Comment 1 Vlad Zahorodnii 2024-02-12 09:08:48 UTC

The show fps triggers constant repaints. kwin seems to spend most of its time in the driver code.