I had this problem today in the harbor level. i posted on 2 topics and..i've not received any answer yet.
1600x900, all settings on ultra, vsync off, dx11 and hd textures enabled.
Asus HD 6870 DirectCU 1 gb ddr5 (915/4200 mhz).
catalyst 11.5.
Unfortunately we're all in this together, I continue to write so that someone will notice and rectify the situation. Crytek, please reply
The people over at Day 1 Studios know how to do it; they are actively involved and equally important; communicating with its customers. Come on Crytek; it's can't be that difficult to communicate with us.

http://www.fearfans.com/forum/showthread.php?t=17264&page=4