[$] Making Python faster

The Python core developers, and Victor Stinner in particular, have beenfocusing on improving the performance of Python 3 over the last fewyears. At PyCon 2017, Stinnergave a talk on some of the optimizations that have been added recently andthe effect they have had on various benchmarks. Along the way, he took a detour into some improvements that have been made for benchmarkingPython.