In my experience, with KDE Plasma, Nvidia is quite awful. Animations are laggy, and the desktop slows down when a new window opens. As well, there are a bunch of small issues I’ve only seen when using Nvidia.
I run KDE Plasma. I have no issues with the animations. I am not sure why your experience would be different.
In the past, anyone experiencing that sort of thing had a MTRR issue from how the BIOS set things up that could be fixed by setting NVreg_UsePageAttributeTable=1 on the Nvidia kernel module, but I have not heard of anyone in that situation for a few years now. I had been under the impression that the setting was obsolete as Nvidia had made it the default behavior.
In the past, anyone experiencing that sort of thing had a MTRR issue from how the BIOS set things up that could be fixed by setting NVreg_UsePageAttributeTable=1 on the Nvidia kernel module, but I have not heard of anyone in that situation for a few years now. I had been under the impression that the setting was obsolete as Nvidia had made it the default behavior.