My frame rate kept bouncing back and forth from 20 to 150 today. I haven't seen that before. Moving the sliders seemed to have no effect, I turned everything to absolute minimum and 1k textures and that got it up to 35-40 most of the time.
I am also still getting the occasional game freeze up. I've seen someone else mention this: when I tab out the game no longer appears under applications in task manager, so I tab to processes and close it there.
One thing on the graphics: the haze at sea level is so bad that ships are invisible beyond about 10k. That really needs to be fixed. Also sea mode gunnery doesn't work correctly, the shells don't hit on the zero has of either the gray or the yellow scale. In AH2 in sea mode they'd hit where the zero has on the yellow scale was when you fired.