Kinda odd that nobody's yet to blame steam for the problems. I mean why blame oleg, luthier and ubi only when we can spread the hate even more!
I'll start:
I heard a guy translated a russian review in wich they declared that steam drops the fps by 20% on low end machines. Combine that with the ubi filter that drops it buy 35%, oleg's color corrections by 25% and luthier's flying hat by 15% we're left with 5% of the intended fps! I'm going to cancel all my preoders and buy random game X instead!