Only IE can work with Active-X. So Safari, for all its speed and beautifully rendered pages, is a fail vs IE. More and more sites are using Active-x, .net and asp.
I'm not even gonna comment on that... other than saying I'm not gonna comment. Okay, I can't help it. Did you just say Safari is a FAIL vs IE? Really? I mean, really? Are you on the IE development team?
I just ran the SunSpider JS Benchmark on my sig machine
Safari 4: 676.8ms
Firefox 3.0.6: 2667.6ms
Maybe I'll reboot into Vista later tonight and run the tests on IE7, although I know from the post that it'll be wretched. Therefore, in terms of speed, IE=FAIL.