Support for systems consisting of multiple languages would be
helpful. Systems using SQL stored procedures and another language,
or XML configuration files are very common.

I also tend to need to model connected artifacts: JIRA tickets,
requirements, releases.

"20mn are currently needed to load a 1 million elements model. "
20 million what? The inheritance depth and #instVars in current FAMIX
are problematic indeed. It is much too easy to run out of memory.

The storage of calculated measurements also needs changes:
mostly I calculate the same measurements for all (or a group of)
methods/classes/units. Storing them in a dictionary for each instance
is very wasteful.

Cheers,
  Stephan