Want to know somthing terribly evil?
Batman Arkham city is a nvidia Dx11 Benchmark title, but rocksteady did something borderline diabolical; they purposely sabotaged the games optimization by including corrupt engine files, so any GPU card could barely hold its ground, essentially forcing you to upgrade graphic cards because the game was sooo "demanding."
Some people came across these files, and when treated upon removing them, noticed, literally, an exponential framerate increase, some people reported having 40 fps on max, to 110 fps, personally, i went from terrible stuttering, to no stuttering. (i always run vsync).
I hope Crytek doesn't do the same.. :/
Pretty =/= always demanding, look at the chrome 5 engine. Runs on consoles without a sweat. AI is pretty stupid though...