Or even Pypy. This is how they measure up: % python2 fibtime.py elapsed time: 83.330840 seconds % python3 fibtime.py elapsed time: 89.325043

Or even Pypy. This is how they measure up: % python2 fibtime.py elapsed time: 83.330840 seconds % python3 fibtime.py elapsed time: 89.325043 seconds % pypy3 fibtime.py elapsed time: 5.799757 seconds