Using hardware acceleration in a contrived example, IE 9 is faster at rendering fish. Yawn. Nothing Microsoft does now can make up how awful IE 6,7, and 8 are and the fact that most of my day-to-day pain is caused by supporting their crap-tastic browsers. Even IE 8 leaks memory like a sieve.
What's frustrating to me is that they could fix the problem of high usage of old IE versions. They just seem to be unwilling to. They could add in IE7's and IE8's rendering engines into IE9 as compatibility modes, push out IE9 as a forced or automatic update and have HTML5 ready to use in a few weeks. But they seem to be more worried potential whining from update-averse users than holding back the technological progr…
Edit, security ok, version upgrade not ok.