It's not a hardware problem.
It's a porting problem ... the mac version is bad.
I have a dual 1GHz, 1,5 GB Ram DDR 333, GeForce4 Ti 128MB DDR and the game is slow.
In singleplayer there are some maps in which my FPS are 5-7...
Multiplayer is better, but not really good.
This is the best game in the world and I have to play in these conditions with my mac?!?!?
The developers says that the game uses the same 3D engine as Quake 3, but Quake 3 on my machine is really fast. They extremely modified Q3 engine and also in PC version the gameplay is slow, but not as in mac version.
Return To Castle Wolfenstein use really Q3 engine and, as a a matter of fact, the gameplay is fast.
I'd like to think that an update could improve the game, but i know that it's impossible. They should rewrite 3D engine code ...