Nice! My test suite got around 20% faster when going from 3.6 to 3.7. That’s almost like buying a whole new computer.
I you care about performance, maybe you should try pypy (the alternative python compiler)
I try PyPy every 3 months. It has improved greatly and for some periods I migrated to it. But for this particular project, most of time is spent inside lxml, pandas, scikit-learn and other extensions. CPython is actually faster than PyPy for this project.
Maybe GraalVM / GraalPython can improve on this use-case.