Part of the speedup appears to be from their use of the Psyco JIT
compiler for the Python code -- the links to source code for Python
end in '.psyco'.

I would guess that some of the Ruby code needs to be optimized, as
well; for example, in the Array Access test, Ruby places dead last.
That's rediculous, and I don't think it's indicative of the array
performance for general cases.

Lennon