haven't tested yet. I imagine it will be slower on the Mac.. Its been forever since I remember a major studio besides ID develop with OpenGL and not just for the DirecX engine... So I imagine there is a learning curve.
Thought I read somewhere that Valve said they'd be working to improve performance... Just glad to see all platforms getting a chance. Now, how about they bring steam to the web. I know you Android fans would love to play some CSS on your Incredible

Na, we'll be too busy playing flash games. Although linux users have been playing cs for years without dual booting, but native support would be great, and since OS-X is just another Unix knock off maybe it isn't too far off.