I've read a lot of performance reports for the mac version of The Witcher 2 for 10.8.3, with rMBP's with 650M's struggling, while iMacs with 675MX's were capable of handling high settings (w/o ubersampling). So I'm a little surprised that my 2008 MP with a GTX570 struggles with low settings at 1280x800 on OS 10.9.1. I've never played the mac version previously, but my computer can handle high settings under bootcamp. Has TW2 performance dropped for all macs in 10.9.1, or do these results sound unsurprising for my machine? Thanks.