As promised, Creative Assembly
has issued the first patch for Total War: Rome II
adding adjustments to performance for certain set-ups that will improve frame rates and DX10 issues. More details can be found on this page
Patch 2 is already in internal testing, and is expected to be publically available as a beta on Monday. The update will include fixes for low-poly models viewed close-up, performance settings on certain hardware combinations and siege battle path-finding amongst other improvements.