Antonio Cangiano recently completed a new Ruby performance shootout:
The Great Ruby Shootout
JRuby has a very nice showing this time compared to the shootout done in February.
Congrats JRuby team!
On a separate note, Charles Nutter (JRuby core developer) recently asked that all benchmarks currently being outperformed by Ruby 1.8.x should be reported as bugs!!! Bold and inspiring!