Bug 514700 - Severe lagging with certain brushes in non-rgb color spaces.
Summary: Severe lagging with certain brushes in non-rgb color spaces.
Status: CONFIRMED
Alias: None
Product: krita
Classification: Applications
Component: Brush engines (other bugs)
Version First Reported In: nightly build (please specify the git hash!)
Platform: Microsoft Windows Microsoft Windows
: NOR minor
Target Milestone: ---
Assignee: Krita Bugs
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2026-01-16 16:28 UTC by C. Shen
Modified: 2026-01-17 08:00 UTC (History)
1 user (show)

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Description C. Shen 2026-01-16 16:28:50 UTC 
SUMMARY
Severe lagging with certain brushes in non-rgb color spaces.

STEPS TO REPRODUCE
1. Create a new image in CMYK or LAB color space
2. Install and use the first brush from https://krita-artists.org/t/memileo-impasto-brushes/92952
3. Paint on canvas

OBSERVED RESULT
Seconds delay from painting to brush effecting

EXPECTED RESULT
Less lag, as much as in standard RGB space

SOFTWARE/OS VERSIONS
Windows 11
Krita 5.3.0-prealpha (git 38b517c)

ADDITIONAL INFORMATION
Comment 1 Wolfgang Baer 2026-01-17 07:58:02 UTC 
Confirmed (Ktita 5.3 on Windows 10)
Any other color space than RGB/Alpha leads to severe lag.
Comment 2 Wolfgang Baer 2026-01-17 08:00:45 UTC 
Tested with memileo brush.