https://bugs.kde.org/show_bug.cgi?id=428090

            Bug ID: 428090
           Summary: Pattern feature produce lag in brush editor when
                    parameters are adjusted
           Product: krita
           Version: 4.4.0
          Platform: Appimage
                OS: All
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Brush engines
          Assignee: krita-bugs-n...@kde.org
          Reporter: mirandagrap...@gmail.com
  Target Milestone: ---

Created attachment 132626
  --> https://bugs.kde.org/attachment.cgi?id=132626&action=edit
images to compare the problem with lag in pattern feature

SUMMARY
Brush editor suffer lacks while editing parameters if we use a normal RGB
pattern. In my desktop with Win10 and i7 the elag is like 0.5 seconds. a bit.
But in the laptop with Kubuntu last update october 2020 and i5 CPU The lag is
arround 3-4 seconds. 
Only happens in brush editor while pattern is active. If we deactivate pattern
feature the brush editor works perfectly again. 
The problem also dissapear if we use greyscale png images. I give link to 2
images as reference. 
Maybe is this maybe i am doing something wrong with RGB saving? let me know
please.

The default Patterns works ok. this lag happens when you copy the png files to
a pattern folder

STEPS TO REPRODUCE
1. Import two patterns included RGB and Greyscale png patterns. or Copy
directly to the pattern folder
https://drive.google.com/drive/folders/1_g_VSbLhGUND7xre1BmXKv-BEnp2LPeH?usp=sharing

2. Open Krita if it is not open 
3. Activate the pattern feature and compare with the 2 imported patterns.

OBSERVED RESULT
lag with RGB png file
no lag with greyscale png file

EXPECTED RESULT


SOFTWARE/OS VERSIONS
Windows:10 
macOS: 
Linux/KDE Plasma:Kubuntu 2020 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION
Tested in 4.3 and 4.4. Same result.

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