Created attachment 153011 [details]
Resizing windows with different animation speeds

SUMMARY
The speed of resizing a window seems to be affected by the animation speed set in system settings. When the animation speed is slower than instant, this makes resizing windows feel laggy in my opinion. This gets more apparent when disabling translucency in the desktop effects. I'm not entirely sure whether this is a bug or expected behavior.


STEPS TO REPRODUCE
1. Set animation speed in system settings to instant
2. Resize a window
3. Set animation speed to medium
4. Resize a window, observe window resize effect lagging behind mouse cursor

OBSERVED RESULT
Window size updates slower when the animation speed is not set to instant.

EXPECTED RESULT
Expected window to update instantly, no matter which animation speed is set.

In case this is expected behavior, is there any way to set animation speed of specific animations in kwin, so that I could make the windows resize instantly without setting instant animation speed for all animations?

SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.26.1
KDE Frameworks Version: 5.99.0
Qt Version: 5.15.6
Kernel Version: 6.0.2-arch1-1 (64-bit)
Graphics Platform: X11
Processors: 16 × AMD Ryzen 7 3800X 8-Core Processor
Memory: 15,5 GiB of RAM
Graphics Processor: NVIDIA GeForce RTX 2080 SUPER/PCIe/SSE2