https://bugs.kde.org/show_bug.cgi?id=417902

            Bug ID: 417902
           Summary: Moving things becomes laggy as the Krita window gets
                    bigger.
           Product: krita
           Version: 4.2.8
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: General
          Assignee: krita-bugs-n...@kde.org
          Reporter: acc4commissi...@gmail.com
  Target Milestone: ---

SUMMARY
I've tested the Nightly build(git de8ea34), 4.2.8, 4.1.7, 3.3.3. Happens in all
of those.

As the Krita window gets bigger, 

- Choosing color in Advanced Color Selector(And other color selectors) becomes
insanely slow. If I drag the cursor to another color inside the triangle or the
square, I have to wait until the moving is finished, and it takes a long time.
- Moving vector objects becomes slightly laggy.
- Moving canvas view with Pan Tool becomes slightly laggy.

There're the slowest in full-screen mode(Ctrl Shift F).

And there could be other stuffs behave like this.


* It happened in Linux Mint 19.3 Cinnamon too, and also in Windows but not as
badly as it is in Linux.


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Kubuntu 18.04
(available in About System)
KDE Plasma Version: 5.12.9
KDE Frameworks Version: 5.44.0
Qt Version: 5.9.5

ADDITIONAL INFORMATION

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