[vodkapump]

Yeah I really don't understand it. There really has to be something wrong somewhere because I can't imagine KDE actually being as bad as I experience it, because absolutely nobody would be using it if so.

To me my favourite is xfce by far, it is so simple and fast without being too simple where it becomes an inconvenience. But, I need wayland so Gnome and KDE are the only really good alternatives for now. (Yes I know there are plenty of alternatives like sway, enlightenment, etc etc but no.)

[neurostimulant]

Are you using Nvidia? I remember there was an issue with Nvidia and Aurorae (one of the window decorator used by kde). Try changing system theme in kde settings in case one of them doesn't trigger the slowdown issue.

[vodkapump]

Same issues on both my nvidia desktop, my amd desktop, and my amd laptop. I definitely first suspected nvidia, since well, it's nvidia. But I wouldn't have the exact same issues on other machines without nvidia as well then..i hope