Since the update, the OSX game start bug has disappeared. Additionally, the whole thing just feels a lot snappier - better framerate, better response times, and fewer slowdowns.
That said, there's one major performance bug still in existence, which has been mentioned before - the big lag at mission start. For about 15 seconds after beginning, the game plays at about 1 frame per 3 seconds while it apparently catches up with whatever has been happening while the level loaded. Speaking of which, anything to be done about the loading time? It really is very, very long.
[ March 24, 2006, 12:10 PM: Message edited by: Pirate Bill ]