https://bugs.kde.org/show_bug.cgi?id=459357

            Bug ID: 459357
           Summary: New "Slide virtual desktops" is too slow and causes
                    render bugs
    Classification: Unclassified
           Product: kwin
           Version: 5.25.5
          Platform: Manjaro
               URL: https://www.youtube.com/watch?v=9qMFfbyl5L8
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: effects-window-management
          Assignee: kwin-bugs-n...@kde.org
          Reporter: ppeli...@gmail.com
  Target Milestone: ---

SUMMARY
After system update, switching virtual desktops became very slow.
Possibility to change it's speed has disappeared.
Some windows are being improperly displayed during switching between virtual
desktops.

(Please see attached video link)

STEPS TO REPRODUCE
1. (Optional step) run Conky or other window overlay app,
2. Turn on the "Slide desktops when switching virtual desktops" animation
option,
3. Try to switch virtual desktops.

OBSERVED RESULT
Animation is very slow. (Much slower than in previous KDE version.)
There is no option to change it's speed. 
Overlay windows such as Conky are being displayed on top of other windows
during animation.

EXPECTED RESULT
Slide animation should have option to customize it's duration.
Rendering overlay windows should be the same during animation as during normal
operation.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Manjaro KDE
KDE Plasma Version: 5.25.5
KDE Frameworks Version: 5.97.0
Qt Version: 5.15.5

ADDITIONAL INFORMATION
Video link:
https://www.youtube.com/watch?v=9qMFfbyl5L8

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