New issue 1863: PyPy super slow running parameterized test suite https://bitbucket.org/pypy/pypy/issue/1863/pypy-super-slow-running-parameter... Donald Stufft: Filing this because Alex told me to! I have the packaging library (https://github.com/pypa/packaging) and as part of that it generates a ton of tests using ``pytest.mark.parametrize``. In total there are a little over 25k tests that come from a total of 45 actual functions. Running the tests under PyPy is massively slow. CPython runs the entire suite in 1-2 minutes while PyPy takes ~15 minutes (See: https://travis-ci.org/pypa/packaging/builds/34763838). Reproduction: ``` git clone https://github.com/pypa/packaging.git tox -e py27 # Fast, ~30s on my machine tox -e pypy # Slow, ~618s on my machine I tried running a OSX nightly but I got an unrelated error even trying to run the binary.