New issue 2303: struct.unpack() is 15x~ slower on bytearray than bytes. https://bitbucket.org/pypy/pypy/issues/2303/structunpack-is-15x-slower-on-bytearray Naoki INADA: PyPy 5.1.1 on Mac See this snippets: https://bitbucket.org/snippets/methane/5K6qB