Dx11 mode really impacts performance. Although the gameplay itself run with 40 fps transitions to cutscenes and the animation after every brawl are a slideshow. Can anybody use dx11 without slowdowns?
I'm sure some can. However the developers have admitted to having a poor DX11 implementation.
We have received reports of performance issues from players of Batman: Arkham City on PC. After researching the matter, we found that running the game with DX 11 is causing the performance issues. We’re working on a title update to address this matter and expect to make it available in the near future.
In the meantime, a workaround for this issue is to run the game with DX 9 instead of DX 11. Instructions on how to turn off DX 11 are listed below.
We sincerely apologize for any inconvenience with your gameplay experience and thank you all for your patience as we work to resolve this issue.
Link
[Edited by jack_deth, 11/22/2011 10:23:27 PM]