I believe he explains this switch here: http://tratt.net/laurie/blog/entries/fast_enough_vms_in_fast_enough_time http://tratt.net/laurie/blog/entries/fast_enoug

I believe he explains this switch here: http://tratt.net/laurie/blog/entries/fast_enough_vms_in_fast_enough_time http://tratt.net/laurie/blog/entries/fast_enough_vms_in_fast... It's a very good read. IIRC, the reasons aren't really rooted in the language that is used. It's more about the tooling provided by PyPy for constructing a compiler.