Out of curiosity, was your python code relying on dicts or using structured classes ? It looks like Pypy is better at optimizing classes than dictionaries. Whic

Out of curiosity, was your python code relying on dicts or using structured classes ? It looks like Pypy is better at optimizing classes than dictionaries. Which might explain to some degree why people are not seeing the perf improvement they expect. A lot of existing python code rely on dict manipulation which gives decent perf on CPython where classes would play nicer with Pypy.