I have a late 2013 15'' MBPr (2.3 GHz, 16GB, 750M) and I'll be installing Windows 8.1 in Boot Camp because I need Visual Studio for college. Almost all of my Steam games are Mac compatible but I have a few (and I intend to but more) that only run on Windows so I'll be installing Steam on Windows when I get the Boot Camp going. What I'm wondering if I should also install Steam on OS X and run the Mac compatible games there or if they perform just as well on Windows. If there is not difference in how they run, I won't be installing Steam on OS X since it would be pointless to install it twice (all games run on Windows anyway). However, if there is a difference, I'll be installing it on both OS X and Windows. Thanks!