Bug 510144

Summary:	Mouse pointer keeps stopping for a few seconds with multiple windows open and 1000Hz mouse polling rate
Product:	[Plasma] kwin	Reporter:	mf.finland707
Component:	input	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	NEEDSINFO WAITINGFORINFO
Severity:	major	CC:	akselmo, duha.bugs, kdedev, nate
Priority:	NOR	Keywords:	efficiency-and-performance
Version First Reported In:	6.4.5
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
See Also:	https://bugs.kde.org/show_bug.cgi?id=510046
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description mf.finland707 2025-10-01 21:42:58 UTC

SUMMARY
Sometimes when moving my mouse, the cursor keeps freezing for a few seconds.

STEPS TO REPRODUCE
1. Use a Logitech G305 mouse.
2. Open a few windows

OBSERVED RESULT
The pointer goes stuck for a few seconds periodically as long as there are too many windows open.

EXPECTED RESULT
The pointer should not get stuck.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.18.0
Qt Version: 6.9.2
Kernel Version: 6.16.8-arch3-1 (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 5500
Memory: 16 GiB of RAM (15.5 GiB usable)
Graphics Processor: AMD Radeon RX 6600

ADDITIONAL INFORMATION
180Hz and 75Hz monitors
The bug could only need a 1000Hz mouse and not the specific model.

Comment 1 TraceyC 2025-10-02 15:12:24 UTC

Can you give us a screenshot of `top` or the tool of your choice when the bug is happening?

I've also seen this on 6.4.5 with a Logitech G502 Lightspeed mouse, but had chalked it up to an app / electron since Obsidian Notes was always at the top of the process list, and the stuttering would stop happening if I closed it.