Pyston is a performance-optimizing JIT for Python, and is drop-in compatible with the standard Python interpreter. There are two ways to use the Pyston JIT: Pyston "full" is a fork of CPython 3.8.12 which contains the JIT as well as numerous other optimizations. It is roughly 30% faster than CPython on web serving macrobenchmarks. Pyston "lite" is an extension module that contains just the JIT. It