https://bugs.kde.org/show_bug.cgi?id=513071

            Bug ID: 513071
           Summary: Regression hardware cursor isn't staying smooth under
                    extreme load
    Classification: Plasma
           Product: kwin
      Version First 6.5.3
       Reported In:
          Platform: Arch Linux
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: wayland-generic
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

SUMMARY

Regression hardware cursor isn't staying smooth under extreme load

STEPS TO REPRODUCE
Easiest test compositor-killer

OBSERVED RESULT

Cursor performance degrades  under high usage. 

EXPECTED RESULT

Smooth cursor always

SOFTWARE/OS VERSIONS

Operating System: Arch Linux 
KDE Plasma Version: 6.5.3
KDE Frameworks Version: 6.20.0
Qt Version: 6.10.1

ADDITIONAL INFORMATION

Regression alert The hardware cursor has, at some point during Plasma 6.5.x or
maybe with Qt 6.10.x, become sluggish again. It's not as bad as when the
hardware cursor wasn't a thing; luckily, it didn't go back to being that bad.

Anyways, I tested a live plasma ISO with an older version of plasma, plasma
6.3.5 using compositor-killer and the mouse movement is buttery smooth with no
stutter/sluggish movement whatsoever.

Afterward I tested compositor-killer in the Gnome desktop, and it gives the
same result as the old Plasma 6.3.5 test: the cursor is also buttery smooth
with no lag whatsoever.

So yep, there's 100% a cursor smoothness regression in the latest Plasma.

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