https://bugs.kde.org/show_bug.cgi?id=385276

            Bug ID: 385276
           Summary: Krita canvas lags on larger displays on macOS
           Product: krita
           Version: unspecified
          Platform: Compiled Sources
                OS: OS X
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: krita-bugs-n...@kde.org
          Reporter: bernhard.li...@gmx.org
  Target Milestone: ---

Krita's graphics output on macOS is relatively slow, and it is very slow on 5k
iMacs.

This seems to be related to QT's QWidget implementation on macOS. And this is
probably a well-known problem.

If not, this ticket can keep track of infos about QT's state of things. 

Two useful pointers I found:

https://forum.qt.io/topic/59578/rendering-performance-problems-on-imac-with-retina-5k/24

https://bugreports.qt.io/browse/QTBUG-44228

As QT's OpenGL compositing internally happens with and without Krita's OpenGL
canvas, switching to Krita's raster canvas does not make a difference.

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