Bug 515820

Summary: Krita 5.3.0 beta 1 : User Interface is Absurdly laggy, slow and stuttering in many places
Product: [Applications] krita Reporter: stephen <tgdev001>
Component: UsabilityAssignee: Krita Bugs <krita-bugs-null>
Status: REPORTED ---    
Severity: normal CC: dimula73, griffinvalley
Priority: NOR    
Version First Reported In: 5.3.0-beta1   
Target Milestone: ---   
Platform: Microsoft Windows   
OS: Microsoft Windows   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description stephen 2026-02-10 15:54:24 UTC 
***

SUMMARY
Starting a certain build version, Krita 5.3.0 prealpha and now Krita 5.3.0's first beta, is
running with a UI extremely slow in almost all places. 
The only place that is seemingly not affected is the scratchpad. 

STEPS TO REPRODUCE 
1. Open a document and create multiple layers, at least 3 or 4
2. highlight one layer or the other with the mouse left click
3. on the canvas, attempt to rapidly make fast strokes with a 
simple brush. The basic opacity or ink brush is fine

OBSERVED RESULT
Stutter, delays, or lags with all the operations described above.
Major freeze with the rapid strokes on the canvas.
Oddly enough, the scratchpad isn't affected by the lag and stutters/delays.

EXPECTED RESULT
No stutter or lag on the UI or the canvas.

SOFTWARE/OS VERSIONS
Windows 10 Pro

ADDITIONAL INFORMATION
CPU : Core-i7 3rd gen mobile
GPU : Nvidia GT640 M
Comment 1 wolthera 2026-02-10 15:55:14 UTC 
Can you identify which build it started at? (Or the last build that did not have this problem)
Comment 2 stephen 2026-02-11 12:59:39 UTC 
(In reply to wolthera from comment #1)
> Can you identify which build it started at? (Or the last build that did not
> have this problem)

Last prealpha build I remember to not have this problem is build 9c6e268b, version 5.3.0.
Comment 3 Dmitry Kazakov 2026-02-11 14:47:04 UTC 
Hi, Stephen!

Could you please make a video of the problem?

And could you also check if you have GPU Acceleration enabled in the settings?