dx11 mainly is tesslation depth of field and sixy shadows
all of which kill your fps
but look at heaven benchmark 2.1 on youtube maxed out then just imagine that+crysis visuals
its what the gaming world is waiting for
What card do u have? THe new HD 6900 series has better A LOT faster tesselation than 5000 series and I dont even notice any FPS drop when I turn it on (and IM sure its working because I see changes on characters when im turning it off/on)
ofc ur right depth of field eats all of ur fps but I dont even see the difference between dx10 DOF and dx11 DOF in metro . By the time theyll use it like in 3dmark11 we will have HD7000 -8000 series . Also when enabling dx11 shadows in bad company 2 or dirt 2 I also didnt notice any big fps drop.... dunno what ur talking about.