Here's my perfdump, extracted from the launch log. This was on Barracks in a 44 man server. Looking towards the center of the map from outside one of the perimeter buildings. Actually just looking towards the building, nobody in view, was sitting at about 30FPS at the time. Lowest I saw during the game was about 25, average 35. My GPU usage was about 40%, sometimes less, rarely more. This was in crossfire so both were about 40%. Without crossfire on it generally performs the same. High settings, normal occlusion, framerate smoothing off, enhanced post processing, hardware physics.
AMD X4 965@3.9ghz
AMD HD5850@900/1200mhz in CrossfireX
G.Skill 1333mhz 4gb RAM