Low FPS cause the game to studder like a slide show.
The reason it does this is b/c you are changing the camera reference so the computer has to recalculate everything b/c your changing your reference to all the meshes, icons, textures, weaponfire, explosions, etc etc etc.
Running the game on 8x causes me alot of problems. I minidump more often doing that than I ever had with anything else. Even more so if you got large fleets/large trade routes ingame. Why are you running the game at 8x? Too slow for you? lol