What's you GPU?
If you have a HD4000, even a performance patch is not gonna help you, it's just not made for gaming. If you have a GT650M, yes, you'll need a performance patch.
Well its was completely playable under Windows on the HD 4000, hell I played it on the 9400M years ago, it was fine. Performance is probably 2-3x worse under OS X for no good reason. That fact some of Apple's highest end graphics cards still have issuses with the game a few years after release says something about the port. Now I'm not complaining and I get that Feral probably didn't think the patch would take this long (or the game would run so badly) so I think it's fine. Everything else they've done has been top notch!