I read a little about GSP, and noticed that many people report performance problems when GSP is enabled. I disabled it:
Edit the file /etc/modprobe.d/nvidia-gsp.conf and set the flag:
options nvidia NVreg_EnableGpuFirmware=0
Then rebooted the system. And it completely eliminated the problems with the smoothness of KDE Plasma. Scrolling in browsers has become absolutely smooth, as well as moving and resizing windows. I checked everything with the proprietary nvidia driver package. The nvidia-open package I haven’t checked it yet, but I think for the sake of interest I’ll check it later and write about the result. Thank you all for your help!
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