I know some of the implementations there use native libraries that are built into python but only available via RubyGems for Ruby, like numpy. That makes it less of a language shootout (at times) and more of a "who ships the best C libs" shootout.

I believe MRI is generally faster than Python now when they're doing roughly equivalent work in Ruby and Python.

> use native libraries that are built into python

Specifically?

> I believe MRI is generally...

Show me the numbers ;-)

PyPy?

Too cryptic!