From the discussion Other Ruby implementations
Sat, 27 Sep 2008 09:51:00 -0000
I agree that JRuby is impressive (with obviously the extra bonus of being able to use Java libraries write away) and I also like MacRuby in terms of speed. For a beta release (0.2) it’s speed is really ok and also it can be useful for Mac addicts / programmers :)
If anyone is interested I have posted (some months ago – I should update them at some point!) some benchmarks on all of them except IronRuby