Python manages to have decent performance because NumPy uses an APL-like model and it happens to skirt the design flaws (dynamic typing, interpreted). J for instance has a tree-walking interpreter written in C that performs well!
Ruby's poor performance hobbles it even in places it's supposed to be good (twitter was rewritten to Scala over rails).
Ruby's poor performance hobbles it even in places it's supposed to be good (twitter was rewritten to Scala over rails).