https://bugs.kde.org/show_bug.cgi?id=395705

            Bug ID: 395705
           Summary: Editing Masks is Very Slow
           Product: krita
           Version: 4.0.4
          Platform: MS Windows
                OS: MS Windows
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: General
          Assignee: krita-bugs-n...@kde.org
          Reporter: k...@kenevans.net
  Target Milestone: ---

Editing a mask by drawing on it is very slow for me.  I have experienced this
mostly with Selection Masks.  Even drawing a small stroke, it can take tens to
hundreds of seconds to display the results.  There is no indication that it is
busy.  Just nothing happens for a very very long delay.

It seems to happen with a Transparency Mask, as well.

It has been consistent (always slow in my experience), and happened with 4.0.3
as well as 4.0.4.

For Selection Masks, the only thing that works for me is to make a Paint Layer
with the mask on it mask on it, then use Select Opaque.  Editing the Paint
Layer is fast and responsive.  Editing the mask after it has been made into a
selection is very very slow. (This workaround doesn't work for Transparency
Masks, which seem to be B&W, not transparency based, nor is a selection
involved.)  Also the workaround doesn't let you see the selection results in
Mask Mode as you paint.  

I don't believe it is the computer.  In general Krita is very responsive for me
(except maybe when using very large brushes). The delay is only with masks.

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