I got brave and switched to the KwinFT window manager. Seems snappier. No problems. But you might have to move panels back to their right place on the screen after first initialization.
No big deal.
I am using the Nouveau driver instead of Nvidia, which is not supported for my card. Also using the 5.15x kernel.
I just discovered that KwinFT puts xrender back into the system. I am happy to see this as it was what I preferred before the big KDE update.