It's the lack of video memory that is the problem. After so much is going on in game, it can't handle all the stuff ingame, kinda why sometimes during the game after playing for 10 minutes or so, if you move your camera down to where the enemy's base is, it just crashes. So, because of the lack of a dedicated GPU in the macbook, C&C3 is unlikely going to work anytime soon for Macbook owners 🙁