Bug 515086

Summary: KolourPaint goes extremely unresponsive and laggy whenever resizing any images
Product: [Applications] kolourpaint Reporter: SimplySand <kdebug3rep0rt.lwyfo>
Component: generalAssignee: kolourpaint-support
Status: REPORTED ---    
Severity: major    
Priority: NOR    
Version First Reported In: 25.12.1   
Target Milestone: ---   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:
Attachments: Recording of an image being resized

Description SimplySand 2026-01-26 03:53:56 UTC
Created attachment 188883 [details]
Recording of an image being resized

SUMMARY
KolourPaint goes extremely unresponsive and laggy whenever resizing any images.

STEPS TO REPRODUCE
1. Paste an image into KolourPaint.
2. Drag its corners, and try to resize it.

OBSERVED RESULT
Editor goes unresponsive and the image expansion seems to have some latency of sorts when resizing an image.

EXPECTED RESULT
When resizing an image, I expect it to follow the cursor without having noticeable latency.

SOFTWARE/OS VERSIONS
KDE Plasma Version: 6.5.5
KDE Frameworks Version: 6.22.0
Qt Version: 6.10.1

ADDITIONAL INFORMATION
My system is beefy system with 16 GB of RAM. Other apps such as LibreOffice Writer do not have such a latency while resizing images.