MRI has been replaced with YARV, which is sometimes much, much faster, and sometimes a little bit slower. With JRuby, MacRuby, Gemstone, and other things in th

MRI has been replaced with YARV, which is sometimes much, much faster, and sometimes a little bit slower. With JRuby, MacRuby, Gemstone, and other things in the pipeline, there are plenty of choices to go around.