What frustrates me is that, even with this add-on disabled, I still get a 1 second pause where the new tab says "Connecting" when I create a new tab. In Firefox and Opera, tab creation is instant-- IE should be the same way.
This has nothing to do with add-ons or anything-- I (and many other people) have seen this since the very first beta of IE7. It's got to be because of some architectural decision on the part of the IE team, and I don't see it getting any better in IE8, with it spawning a new process for each tab and everything (and there was no improvement in Beta 1).
Couple this with poor rendering and Javascript performance, a lack of certain basic end-user features, a disregard for web standards, and a poor extension system, and one might see why I've switched to Firefox and haven't looked back.