Honestly I think this is a problem with your graphics card as the others have said. Updating it MIGHT help but if it doesn't you may be fresh out of luck. So try what has been said above, but I would definitely try uninstalling FH and downloading a new FH setup via the normal download link. It shouldn't lag you any more than the torrent version because it's the same exact game only downloaded differently.
If none of this works, your computer may not be able to handle the game at all.
