Halo for the Macintosh

I recently downloaded the Halo demo for the Macintosh. I was very, very surprised that they had made Halo for the Mac. I think the demo is great, they give you Level 4 and let you play online multiplayer on Blood Gulch. I like how there is fuel rod cannons, and rocket launchers on the back of the Warthog (which wasn't even in Halo 2). Unfortuanately, it lags like the wind, so I don't get a very enjoyable experience out of it. I'm thinking of downloading it for my Windows so I can actually have some fun.