Bug 459354

Summary:	Scrolling is extremely slow when many window decorations are installed
Product:	[Applications] systemsettings	Reporter:	Patrick Silva <bugseforuns>
Component:	kcm_kwindecoration	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	CONFIRMED ---
Severity:	normal	CC:	nate, plasma-bugs-null
Priority:	NOR
Version First Reported In:	5.27.9
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Patrick Silva 2022-09-18 21:30:23 UTC

SUMMARY
Currently I have ~60 window decorations installed on my system. Scrolling all these window decorations is extremely slow, mainly on Wayland session.


STEPS TO REPRODUCE
1. have many window decorations installed on your system
2. open Window Decorations KCM
3. scroll the window decorations list

OBSERVED RESULT
extremely slow scrolling

EXPECTED RESULT
normal scrolling

SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.25.90
KDE Frameworks Version: 5.98.0
Qt Version: 5.15.6
Graphics Platform: Wayland

Comment 1 Nate Graham 2022-09-22 17:56:40 UTC

> Currently I have ~60 window decorations installed on my system
OMG

I can see how it would get slow due to the need to render a preview for everything. Maybe we can optimize that.

Comment 2 Patrick Silva 2023-11-13 19:03:28 UTC

Scrolling is better now, but it is still a bit slow.

Operating System: Arch Linux 
KDE Plasma Version: 5.27.80
KDE Frameworks Version: 5.245.0
Qt Version: 6.6.0
Graphics Platform: Wayland