Batman: Arkham City Performance Preview
 

Batman: Arkham City is upon us, and we wanted to give you a preliminary look at how performance is stacking up. We've found some issues running in DX11 that seem to be a detriment to gameplay. DX11 may not be the best option, at this time, for this game, our performance data and feedback explain why.

http://www.hardocp.com/article/2011/...mance_preview/