Hello, I've managed to backport RinohType to Python 2 (took me only a couple of hours thankfully). Results on my Celeron T3000 (Arch Linux x86_64): CPython 3.3.4 14 s PyPy3 2.1.0-beta1 61 s CPython 2.7.6 15 s PyPy 2.2.1 35 s If you want to give it a try (no external dependencies): git clone --branch pypy2 https://github.com/brechtm/rinohtype.git cd rinohtype/examples/rfic2009 rm -rf template.ptc; PYTHONPATH=../.. pypy template.py While PyPy2 performs better than PyPy3, it's still much slower than CPython. Is RinohType hitting a weak spot in PyPy? Any hints on what I can do to improve performance? Best regards, Brecht