https://bugs.kde.org/show_bug.cgi?id=444919

            Bug ID: 444919
           Summary: Big size brush become more stutter on Direct3d 11 via
                    ANGLE
           Product: krita
           Version: 5.0.0-beta2
          Platform: Microsoft Windows
                OS: Microsoft Windows
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: OpenGL Canvas
          Assignee: krita-bugs-n...@kde.org
          Reporter: ss93...@gmail.com
  Target Milestone: ---

Created attachment 143188
  --> https://bugs.kde.org/attachment.cgi?id=143188&action=edit
Beta1 and Beta2 comparison Direct3D via ANGLE

SUMMARY
When performing fast brush stroke using Big brush, especially with brush tips,
will cause the brush outline and stroke being more stutter than in Beta1 when
Canva Acceleration is set to Direct3d 11 via ANGLE.
OpenGL performs quite well.

STEPS TO REPRODUCE
1. Set Canva Acceleration to Direct3d 11 via ANGLE
2. Create new file A4 300dpi, select a brush which need some calculation, g)Dry
Bristles for example, or some low spacing round brush like b)Basic-3 Flow.
3. Set brush size to around 500px or higher
4. Without canva zoomed in, perform fast zig-zag stroke to paint over canva.

OBSERVED RESULT
Brush outline and brush stroke get massive frame skip when brush stroke cannot
keep up with the cursor.

EXPECTED RESULT
Should not get that much frame skip.

SOFTWARE/OS VERSIONS
Windows: windows 10 20H2

ADDITIONAL INFORMATION
Small heavy calculation brush like RGBA-smudge brush don't have this issue.
Tested on Pentium 3825U with intelHD, maybe it need bigger brush size to
distinguish frame skip on decent machine.

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