Bug 512668

Summary: Dragging icons very laggy and sometimes fails
Product: [Plasma] plasmashell Reporter: pallaswept <pallaswept>
Component: Task Manager and Icons-Only Task Manager widgetsAssignee: Plasma Bugs List <plasma-bugs-null>
Status: REPORTED ---    
Severity: normal CC: nate, qydwhotmail
Priority: NOR    
Version First Reported In: 6.5.0   
Target Milestone: 1.0   
Platform: Other   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description pallaswept 2025-11-27 09:55:54 UTC
SUMMARY

Since Plasma 6.5, I have noticed that when I drag icons in the icons and text task manager, it is very laggy, and fails sometimes. It's as though it's only updating every 500ms or so. I have confirmed this with a new user account.

STEPS TO REPRODUCE
1. Open several apps
2. Click and drag one of them to move it. Move fast for better reproduction

OBSERVED RESULT
Icon lags behind the mouse cursor. When stopping the cursor, sometimes the icon is left behind. Moving the cursor again by 1 px will cause the icon to 'catch up'.

EXPECTED RESULT
Icon stays below the cursor

SOFTWARE/OS VERSIONS
> kinfo
Operating System: openSUSE Tumbleweed 20251125
KDE Plasma Version: 6.5.3
KDE Frameworks Version: 6.20.0
Qt Version: 6.10.1
Kernel Version: 6.17.8-2-default (64-bit)
Graphics Platform: Wayland
Processors: 24 × AMD Ryzen 9 5900X 12-Core Processor
Memory: 32 GiB of RAM (31.2 GiB usable)
Graphics Processor: NVIDIA GeForce RTX 3090

ADDITIONAL INFORMATION