I can imagine no possible reason why someone would want Safari on a PC
http://www.anandtech.com/mobile/showdoc.aspx?i=3636
Well, it does feel WAY faster (or smoother) than Firefox. Firefox is just pure bloat.
Opera on the other hand is lovely love.
This is probably one of the stupidest MS complaints I've ever heard. The fact that it's getting so much attention is quite hilarious.
It's Flash. Flash has always be horribly unoptimized on Macs. I remember it used to make the fans crank up on my dual G5 whenever I loaded up a page with Flash on it (even just a little ad).
It's worse for Linux