try downloading full install, and before new install, uninstall old one and delete all remainig folders in your ah2 directory / (settings, ect...) I found that once i did this, I got better fps....lol - no clue on how that helped.
After you install AH2 - create a settings folder and import you js file and all .kmps into that from ah1 so you dont have to set up your joystick.