I created this mission in the FMB and ran it.. worked very well so I DL'd fraps.. the FPS with FRAPS are actually a little lower than they were without it..and the video ends right before my awesome guns pass <G> But you'll get the idea..
Resolution is 1920X1200 grass OFF, Filter OFF, roads OFF, building settings to lowest possible, both detail and number All other settings are HIGH
Alt is about 5500-6500M and when we flew over land the fps did not grop below the 29/30 bracket..