Hi Armin, to come back to the problem that I've had with the jit ... it's gone now with current default tip. No idea what's up, but I'm plenty happy with things now working again for me. The "heap" optimization does have a significant effect on my code, though, so it's good to have it. I broke the fast path during one of the many merges with default when I had to resolve differences (to be fixed next week?), but the current numbers are still excellent: $ ../../../translator/goal/pypy-cppyy-c-070511 bench1.py rebuilding bench1.exe ... warming up ... C++ reference uses 0.032s :::: cppyy interp cost: 0.523s ( 16x) :::: cppyy python cost: 0.997s ( 31x) :::: pycintex cost: 50.554s (1579x) So a factor of 50 improvement over the current CPython bindings, something that used to be (back in December) a factor of 10 "only." Of course, for a real comparison, I should backport cppyy to pypy as of Dec '10 to know which changes are to be attributed to what, but none of this is the final product, so for now it's simply good enough. :) Best regards, Wim -- WLavrijsen@lbl.gov -- +1 (510) 486 6411 -- www.lavrijsen.net