https://bugs.kde.org/show_bug.cgi?id=515820

            Bug ID: 515820
           Summary: Krita 5.3.0 beta 1 : User Interface is Absurdly laggy,
                    slow and stuttering in many places
    Classification: Applications
           Product: krita
      Version First 5.3.0-beta1
       Reported In:
          Platform: Microsoft Windows
                OS: Microsoft Windows
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Usability
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

***

SUMMARY
Starting a certain build version, Krita 5.3.0 prealpha and now Krita 5.3.0's
first beta, is
running with a UI extremely slow in almost all places. 
The only place that is seemingly not affected is the scratchpad. 

STEPS TO REPRODUCE 
1. Open a document and create multiple layers, at least 3 or 4
2. highlight one layer or the other with the mouse left click
3. on the canvas, attempt to rapidly make fast strokes with a 
simple brush. The basic opacity or ink brush is fine

OBSERVED RESULT
Stutter, delays, or lags with all the operations described above.
Major freeze with the rapid strokes on the canvas.
Oddly enough, the scratchpad isn't affected by the lag and stutters/delays.

EXPECTED RESULT
No stutter or lag on the UI or the canvas.

SOFTWARE/OS VERSIONS
Windows 10 Pro

ADDITIONAL INFORMATION
CPU : Core-i7 3rd gen mobile
GPU : Nvidia GT640 M

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