Message12338

Yes, it is slow for this scenario, at x10 slower as seen here. Jython and CPython should currently be at about the same speed, since they have very close implementations. I did find it interesting that JRuby had very similar performance, which shows how challenging speeding dynamically typed languages is.

There is however one thing that makes things unnecessarily slow: because Jython 2.7 implements the Python 2.7 language, the code should be written to use xrange, not range, which will allocate a list containing 100 million consecutive integers. That's obviously unnecessary overhead.

It is also possible that we can still improve this speed with InvokeDynamic and related support, but that's a hard engineering challenge, even with the improvements in this support in JDK 12.