I see improvements vs 0.5.0, but no benchmarks to compare it to CPython. I assume this means it compares unfavorably.<p>They're aiming to speed up Dropbox's workloads, which is a different focus than PyPy, but they could be more open with how they compare.<p>Here's PyPy's benchmark performance page: <a href="http://speed.pypy.org/" rel="nofollow">http://speed.pypy.org/</a><p>Edit: Pyston has a speed page, but it's missing too much data to make a comparison. :( <a href="http://speed.pyston.org/comparison/" rel="nofollow">http://speed.pyston.org/comparison/</a>