Hi all, I am an open source contributor of Pyston, and working on NumPy Pyston support(Pyston: https://github.com/dropbox/pyston) I disabled some tests which cause segfaults. This is current situation(in my local branch): ---------------------------------- Ran 3240 tests in 80.811s FAILED (KNOWNFAIL=3, SKIP=6, errors=334, failures=74) ---------------------------------- Indeed, the time consuming was longer than CPython. I think this is because of the additional exceptions / frame introspection etc... And no one took yet a look at the perf. Pyston runtime miss some features. I will try to fix the problems which discovered in running NumPy test suite. This is basically an announcement. I will update the situation when I get breakthrough, ask for help if I encounter problems, submit commit to NumPy if needed. Looking for feedback. Regards, Sun