I've found that PyPy is very fast in most cases. While I've seen hand-optimized C code beat PyPy by a mile, I've seen more cases where the gains were in the 10

I've found that PyPy is very fast in most cases. While I've seen hand-optimized C code beat PyPy by a mile, I've seen more cases where the gains were in the 10-20% range. And PyPy keeps getting faster.