OSX as an OS is weaker than Windows at games performance. For example, Valve officially supports Mac & Windows in-house, and running the same game (e.g. TF2) on

OSX as an OS is weaker than Windows at games performance. For example, Valve officially supports Mac & Windows in-house, and running the same game (e.g. TF2) on the same hardware in windows will see framerate increases of 20%-100%.