"It's no secret that when judged by several popular Web browser speed tests, Internet Explorer 8 doesn't hold up well. Beta versions of IE 8 have been available to the general public for more than a year, and today's release of the stable build didn't include anything revolutionary.
Setting aside the issue of speed for a moment, some of the features in Internet Explorer bring it up to what we've come to expect from a browser, and some of them forge ahead. Many of these are borrowed from other browsers, and at least in the case of Firefox, the features can be imported using extensions. Indeed, some of Microsoft's bigger innovations like Web slices and Accelerators were replicated via Firefox extensions a while back." (Continued via CNET, Seth Rosenblatt) [Usability Resources]