True on Jruby/rubinius, its highly dependent on what the code does. I've seen 2x faster runs on rubinius over 1.9.2. And on the other end of the spectrum, I've

True on Jruby/rubinius, its highly dependent on what the code does. I've seen 2x faster runs on rubinius over 1.9.2. And on the other end of the spectrum, I've seen some of my unit tests take over an hour. They take 10 minutes on 1.8.7 on a slow day and cache. And agree on the python bit, ruby may win for a web language/system administration bits, but python definitely has the leg up with support and use in the sciences.