This time HtmlUnit committer Daniel Gredler has been faster to blog about it! 
HtmlUnit 2.1 is now available. We’ve put this release less than 2 weeks after version 2.0 to quickly fix some performance problems that occurred with HtmlUnit 2.0 in CSS processing (users have reported that 2.1 runs up to 5 times faster than 2.0). Additionally this release contains a few improvements and bug fixes as documented in the change log.
