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Message: [QUOTE="Ken Bloom, post: 4631645"] Ruby 1.9 doesn't have an ahead-of-time byte compilation mode as far as I know. That means you only have to run one command to run your modified code. Every time you run your script, the interpreter parses it and byte compiles it, which then results in a speed increase when the interpreter runs the script. JRuby has a mode where it parses and compiles the script every time (the jruby command) and an ahead-of-time compilation mode (the jrubyc command). So Ruby 1.9 can run like perl/python. JRuby can run like perl/python or like C#. --Ken [/QUOTE]