i was using Pypy3 a few years ago,
but back then,
i didn't know why it was faster.
https://www.infoworld.com/article/3385127/what-is-pypy-faster-python-without-pain.html
PyPy vs. CPython
PyPy is a drop-in replacement for the stock Python
interpreter, CPython. Whereas CPython compiles Python to intermediate
bytecode that is then interpreted by a virtual machine, PyPy uses
just-in-time (JIT) compilation to translate Python code into
machine-native assembly language.
Depending on the task being performed, the performance
gains can be dramatic.
On the average, PyPy speeds up Python by about
7.6 times, with some tasks accelerated 50 times or more.
------------ i can't tell if this means the speed of 7.6 or 8.6 times original.
but when i tried today, the new speed was about 9 times the original.
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