Firefox 4 Beta 7 is about three times faster than 3.6.12
 

With the release of Firefox 4 Beta 7, Mozilla returned to near the top spot in browser performance rankings.

According to tests run by Computerworld, the new browser is about three times faster than the current production version of Firefox in rendering JavaScript, and lags behind only Opera among the top five browser makers.

On Wednesday, Mozilla launched Firefox 4 Beta 7, a preview that includes all the features slated to make it into the final, polished version next year.

http://www.computerworld.com/s/artic...ins_speed_mojo