"That gcc and a lot of the open source technology used by both OSs, is a win for the Open Source movement, and also may explain why performance is similar." I'

"That gcc and a lot of the open source technology used by both OSs, is a win for the Open Source movement, and also may explain why performance is similar." I'm afraid Dr. Stallman killed that with GPLv3. Each new OS X release comes with less and less GNU software.