This PEP seems to be proposing introducing a sort of JIT-lite interpreter to CPython. It would make optimisations based on a much smaller number of examples tha

This PEP seems to be proposing introducing a sort of JIT-lite interpreter to CPython. It would make optimisations based on a much smaller number of examples than a traditional JIT compiler and would also back out much more cheaply. It's too early to estimate performance improvements but they are hoping for something on the order of 25-50% (very preliminary). The main compromise here seems to be to make a small, simple change while keeping the maintenance and understandability of CPython. The python-dev thread introducing it is at https://mail.python.org/archives/list/python-dev@python.org/thread/VKBV4X6ZEMRBALW7JNOZYI22KETR4F3R/ https://mail.python.org/archives/list/python-dev@python.org/...