"JRuby 1.1 is the second major release for our project. The main goal for 1.1 has been improving performance. We have made great strides in performance during the last nine months. There have been more and more reports of applications exceeding Ruby 1.8.6 performance; we are even beating Ruby 1.9 in some microbenchmarks. Please try your applications against JRuby 1.1 and give us feedback. If you find poor performance or a compatibility problem, then we want to know about it; message us on IRC, email our mailing list, or file a bug."