Yesterday, Andy committed new code to the compiler, some of which concerned skipping some arity checking.
Also, Stefan meanwhile committed something called "reworked object system" to his python-on-guile.
Sorry for coming with unspecific information (don't have time to track down the details) but I noticed that my benchmark script written in Python, and which computes the 20:th Ramanujan number, now runs 60% faster than before these changes.
This means that python-on-guile running on guile3 master executes python code only 2.6 times slower than the CPython python3 interpreter itself. :-)
Have a nice weekend all,