I'm having pretty bad dips when zoomed in at the unit (down to 17-19 in naval battles with alot going on) running on Ultra. Land battles have dips downs to 20-22 fps while in closeup when unit is firing. HAven't tried lowering the graphics out of principle - gtx 260 sli system should handle this game without any hiccups on highest graphical settings. I just hope it's demo optimization issues.
Q9900 2.5 Ghz Quad, EVGA gtx260 SC in SLI (with 185.20 beta), Raptor2 HD, Vista ultimate 32-bit - running the game at 1680x1050, x4 AA, and x16 AF.