My performance seemed fine. I played on ultra without motion blur and post processing on medium.
Fps where between 60 and 90 most of the time. I don't really notice dips below 60 cause of gsync.
And I still think that either the lighting is bugged or they made something wrong. Today at first it looked like a PS3 game like it does sometimes and 5 minutes later, at the same place, (just outside of Tarsis) the sun was high in the sky and the game looked just stunning. I don't know what's up with that...
And lastly I had a lot of fun again. The game can be really hard and challenging when your team sucks. So a sudden spike in difficulty is a common thing when your teammates die like flys
Oh and a lot of things people complain about are patched and fixed IN THE MAIN GAME. they updated the demo just so far to prevent the loading bug, which was game breaking. Why on earth would they waste any more resources on a demo build? They're thankful and give honest feedback what went wrong in the demo and how it's getting fixed.
Maybe they should have called it beta