Entire OS Freeze but only Cursor is functioning

[filo]

Check also this one (change Compositor settings or switch it temporarily off)

KDE and video freezing and lagging from notifications and popup hovers

From the first boot and even after the balancing I have noticed some lag on screen when notifications occur or if I hover my mouse over the various status tray icons. Especially if I am watching a youtube video and move the mouse over the various status icons it basically freezes the video because its so much lag. I did a variety of searches on the forum to see what the solution might be, but the most I could find is maybe a driver issue, but I have proprietary nvidia drivers installed, not sure…