There were notable performance improvments with several positional argument only functions made 1.3-1.7x faster in stdlib https://bugs.python.org/issue35582.

namedtuple attr access is also now 1.7x faster https://github.com/python/cpython/pull/10495

Other performance improvments : https://github.com/python/cpython/pulls?q=is%3Apr+sort%3Aupd...