I suppose it has to do with my general kde setup and many tweaks and adjustments over the years..maybe i should wipe everything and give it a fresh try..
It actually runs and feels smoother for me in a 144hz display and 2016 NVDIA card. Of course it still has its glitches and strange things happening from time to time, while with Xorg it "just works". I'd say it's still in alpha stage for Nvidia users, which require some tweaking and extra env variables to properly work; and in beta stage for everyone else