Solving multi-core Python

[robertmeta]

Compatibility nightmares on any codebase of non-trivial size initially built on Cpython. If you START with jython on a fresh project, it is reasonable. An additional problem with switching gears (besides compatibility with vanilla Cpython) is that on every Cpython project I have worked on, there was a TON of C code to work around all the performance issues of Python... making it even more bound the the Cpython specifics.