There are three words, which make me sad in combination:
KWin
Wayland
NVIDIA

Only works with radeon cards for now right?

@Wholteza one of the maintainers of KWin said, that they will not implement the EGLStreams standard which is used by (only) NVIDIA, where as Intel and AMD use Mesa, which is supported widely. The only DE which supports EGLStreams atm. is GNOME.

And i just switched to plasma and i love it... And i use nvidia :/

@Wholteza I also love it. I hope NVIDIA gets their shit done. JUST USE FUCKING MESA