In the video, IE9 is still quite a bit slower than Chrome. But it is fantastically superior to IE8.
The great thing about this is that competition works. Microsoft had the opportunity, but didnâ€™t significantly improve their JS engine performance for the last 10 years. It took Google Chrome, what Ballmer calls a â€œrounding errorâ€ to finally make Microsoft improve in this area. In a few years, whether you pick IE or Chrome or Firefox as your browser, rest assured your browser is fast because of competition.