I'm not sure.
It was my first Mac, so I didn't set it up from Time Machine or anything else, which can have a impact of the OOB experience.
It's a totally fresh set-up, also my SIP was already enabled, so I think mine was configured properly from Apple.
I installed already some Programs and other stuff, so I don't think a reinstall will improve my experience.
Btw. I also can live with the actual lags. Sure it's not what a 3000€ device should do, but 90% of the time it's smooth. The 10% Lags during personal usage are noticeable but ok. If Apple can fix this over time with updates, like some of you explained with previous generations, then the UI Lag isn't that bad.