its more like 40-50fps, and thats the first few levels they mention things ramp up later, so it should get worse.
Well they actually showed one of the levels from later and it actually performed better. What matters is the layout. How many open spaces, what's on screen, how many enemies is it possible to see.
I find jt funny they say there's basically no change though. All while showing footage that shows an increase in enemy numbers and an obvious doubling of enemy draw distance.