kwin-effects-forceblur
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System-wide slowdown since Plasma 6.1
My system has been beyond sluggish ever since Plasma 6.1 released on Fedora, and I just found forceblur to be the culprit. This was especially bad when watching videos, even moving the mouse would cause the video to stutter and drop to around 10fps, so forget about multitasking. I'm on a 12th gen Intel NUC for reference.
This sluggishness was completely eliminated when I disabled forceblur, re-enabled native blur, and restarted my system.