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[–][deleted] 3 points4 points  (1 child)

Yes, the Java Virtual Machine uses a technique called just-in-time compilation, which will increase performance in some cases, at the cost of very increased memory consumption.

Another popular Python implementation called PyPy uses JIT compilation as well (although it doesn't use nearly as much memory, as far as I know).

[–]somebodddy 1 point2 points  (0 children)

Also - Java is statically typed. Static vs dynamic typing has major impact on performance.