I just finished the performance optimized pure Python implementation of my RFC3339 date-time library udatetime for PyPy and Python 3.5. The benchmark say PyPy is now officially the fastest with udatetime. Again it’s astonishing how good PyPy performs.

Python 3.5 is by the way again the slowest. I may implement a Python 3.5 C version to fix that, but Python 3.5 can’t compete with Python 2.7 or PyPy performance wise anyways, regardless if it’s in C or not. Which is btw the reason why I would never switch to Python 3.5. I rather wait for PyPy to complete their Python 3 support. Sad.

Benchmark result summary