To me it was very annoying with the PCB 3D view, so I was quite happy when I found the option for anti-aliasing in the menu. It also doesn't seem to affect my system performance at all, even when it's put to maximum.
With the schematics however, I have never noticed such problem, so it's never been annoying to me. It could be because of the nature of the majority of the schematic components combined with the 4K resolution I normally work at, I am not sure.