Inquiring minds would like to know. Was the windows machine tweaked? What flavor of ASIO?
I had to do a lot of stuff to the machine to get Foobar to work and wound as it does today. I agree, it is very stable on my machine and it kicked my Linux setup out of the room for sound and stability. I have not brought it down to compare to the Mac system, but yea, I don't think it would win.