Bug ID: 390463
           Summary: Filter lags in 4.n versions
           Product: krita
           Version: 4.0.0-beta.1
          Platform: Other
                OS: MS Windows
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Filters
  Target Milestone: ---

Krita 4.0 (including beta, nightlies) shows slow performance on overall
filters. And it's especially obvious when applying some filters like 'Color to
Alpha','Gradient Map' to a large image. If the image is larger than around 3k,
4.0 freezes.

Krita 3.3.3 does a fine job.

The applying process seems to be eventually completed if you wait a long time,
but undoing it causes same freeze if the image is big enough. (Undo works fine
on smaller images)

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