> KDE is the most sluggish horrible mess for me every time I try it, it feels like a game constantly fluctuating between 15 and 25 fps when interacting with it.

This may be an issue with your specific hardware. I never encountered slow-downs with KDE, even when fancy compositor-effects were new and I went overboard[1] with them, everything was smooth as butter.

1. Who wouldn't want their wobbly, semi-transparent windows to disappear in a burst of flames when closed?