On a fairly beefy Ubuntu System, found that pypy3 was about 40 times fatser than python3.
~/pypy-test$ pypy3 test.py
Sum of 1000000 numbers is : 499999500000
Elapsed time is : 0.0026879310607910156 seconds
~/pypy-test$ python3 test.py
Sum of 1000000 numbers is : 499999500000
Elapsed time is : 0.08730697631835938 seconds