I had so many add-ons for FSX. A lot of high detail scenery, my favorite planes done up in very high quality, additional traffic. Had Track IR (tracks your head movement so that you look around in game by head movement), rudder/brakes pedals, yoke, throttle quadrant and different HOTAS (hands on throttle and stick) and some panels so I can flip switches instead of mouse click/keyboard for different things. My computer ran it fine, not sure if that's what you mean or that the planes are slow? I use to aircrew on C130's, over 6,000 flight hours. FSX is pretty accurate and that's what most people into this stuff want.