You can always match the speed of java in critical areas by disabling number boxing, adding type hints, and using the mutable versions of data structures. This

You can always match the speed of java in critical areas by disabling number boxing, adding type hints, and using the mutable versions of data structures. This is what prismatic did for their ML computation code: http://www.infoq.com/presentations/Why-Prismatic-Goes-Faster-With-Clojure http://www.infoq.com/presentations/Why-Prismatic-Goes-Faster...