http://www.zdnet.com/the-big-browser-benchmark-january-2013-... http://www.techradar.com/us/news/software/applications/best-...
I use Safari daily, both to test and to visit several popular websites. My experience is that it's the first to somehow lock up with even a moderate number of windows/tabs open.
There's a lot of things to like about OS X, but these days I don't think Apple's heart is in web-related stuff.
Granted I still use Firefox because I sync bookmarks to Windows, but if I could sync FF for Windows and Safari for Mac I'd switch back tomorrow. Not so keen on Safari for Windows or iCloud sync.
Ah, those days of young browsers when Firefox was called Firebird and Chrome version numbers went up by dot increments, not integer jumps. It isn't that long ago either!