We've already seen some evidence that Macs running Steam are generally more powerful than PCs running Steam, and it looks like Apple is busily working to make sure that all potential performance is put to good use. As Valve's Rob Barris has confirmed on the company's forums, Apple, ATI and NVIDIA are all "involved" in improving Mac gaming performance, and that "performance is going to improve as drivers are updated." Barris further went on to say that he expects "modest improvements in short term and larger ones in longer term," but wouldn't offer any specific date
