B2 while improved was unusable to me from a performance point of view. Like I said, beta 3 is almost as fast as microb

Edit:

Here's what the browser says:

Firefox/4.0b8pre Fennec/4.0b3pre

I have no idea the b3pre means but this is not b2. Maybe I accidentally pulled a nightly build. It's waay better IMHO. Beta 2 had the problem where the pages would render blank even though the thumbnail showed that it was rendering properly.