eric wrote:

>  (and see) 0% overhead for importing standard modules (by far the most
>  common case).  Adding 10% overhead to importing a very large package
>  with 10-15 nested sub-packages is just not a big deal.  The 350% cost I
>  saw (noted in a response to Gordon) is a *huge* deal and would need to be
>  solved (moving to C would help) before this became standard.

I have code which caches directory contents, and related benchmarks.
This might help, and could be combined with a new Python module
for importing packages, say, as a new method "importer" in __init__.py.
Please see python-dev, "Caching directory files in import.c".

JimA

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