Bug 489797

Summary:	Stutter when dragging window to tile or maximize it
Product:	[Plasma] kwin	Reporter:	dans64
Component:	performance	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	NEEDSINFO WAITINGFORINFO
Severity:	minor	CC:	fanzhuyifan, kde, kdedev, kroot.patel, schwarzevahur
Priority:	NOR
Version First Reported In:	6.1.2
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
See Also:	https://bugs.kde.org/show_bug.cgi?id=481610 https://bugs.kde.org/show_bug.cgi?id=498544
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	mouse stutter video

Description dans64 2024-07-05 17:13:45 UTC

SUMMARY
Kwin breifly stutters when tiling or maximizing a window 

STEPS TO REPRODUCE
1. drag window to the sides of the monitor or the top
2. make sure the side tiling or maximizing happens
3. move mouse around

OBSERVED RESULT
mouse will stutter afterwards after the animation is complete

EXPECTED RESULT
there should be no stutter

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux 6.9.8
(available in About System)
KDE Plasma Version: 6.1.2
KDE Frameworks Version: 6.3
Qt Version: 6.7.2

ADDITIONAL INFORMATION
might be similar bug to https://bugs.kde.org/show_bug.cgi?id=487043

Comment 1 fanzhuyifan 2024-08-03 03:37:15 UTC

Could you upload a video demonstrating the issue? Thanks!

Also this might be BUG 481610.

Comment 2 dans64 2024-08-03 16:52:42 UTC

Created attachment 172254 [details]
mouse stutter video

Comment 3 dans64 2024-08-03 16:53:30 UTC

It's a bit hard to notice, but it's around the 1 second mark. I'll try to get a better video soon.

Comment 4 fanzhuyifan 2024-08-03 17:00:46 UTC

Can reproduce on wayland, git master -- if you look at the mouse it will stutter just after tiling/maximizing

Comment 5 dans64 2024-08-03 17:21:41 UTC

Thanks, guess I should have clarified a bit more about my setup, dual monitors at 144hz and running kwin wayland.

Comment 6 dans64 2024-08-20 15:39:29 UTC

Ran iotop -o and started dragging windows to quick tile them and fullscreen, looks like it's the same bug as https://bugs.kde.org/show_bug.cgi?id=487043, so it's still not fixed? Moving my mounting my ~/.cache/kwin/qmlcache to tmpfs didnt help and might have made it worse.

Comment 7 Krut Patel 2024-10-16 19:33:45 UTC

Got the same error with Plasma 6.2.1 on X11 - also happens when switching virtual desktops where one has a maximized screen.

Comment 8 dans64 2025-11-01 04:20:21 UTC

This still happens on 6.5.1, although it only happens the first time a window is launched/shows its tiling animation. Once the animation plays once (so it's cached I guess?) it doesn't happen again until you go to a new activity and launch/tile a new window. It is nowhere near as bothersome as it was before but still annoying. I'm using a Windows 7 Aero (Se7en Aero Window decorations, Expose Air Plasma Style, Breeze application style) theme with transparency, maybe that's part of the problem?

Comment 9 TraceyC 2026-01-05 17:08:33 UTC

*** Bug 513906 has been marked as a duplicate of this bug. ***

Comment 10 TraceyC 2026-01-05 17:09:16 UTC

I'm not able to reproduce this on my system
> kinfo                    
Operating System: Solus 4.8
KDE Plasma Version: 6.5.4
KDE Frameworks Version: 6.21.0
Qt Version: 6.10.1

This may be fixed with newer versions of KDE Frameworks and / or Qt
For those who are affected: Can you update your system and see if this still happens?

Comment 11 fanzhuyifan 2026-01-06 10:33:19 UTC Comment hidden (spam)

The original report should be fixed by https://invent.kde.org/plasma/kwin/-/commit/76516a10c0230e0bc5d3fc65e3998425075a6cda.

The later report about this only happening the first time a window is launched should be from a different underlying issue. So I would suggest closing this report and reopening BUG 513906.