Okay.  I think I've plugged the leak with the OBJ export method, and I've sped it up for larger meshes.  It still uses a lot of RAM while processing, but not as much as before, and it releases it afterwards.

A couple of random notes.  It looks like a list of actors may need to be explicitly cleared once you're done with it.  The Export callback option for the import-export object seems to use OnOff() to control what gets exported, but the implementation of such a callback is dreadfully awward (can't accept arguments, can't be part of a class, pretty much requires that the actor screening ref be passed as a global variable) and one is better of just writing a function from scratch to toggle OnOff() for the various actors.

So I'll work on splitting and welding texverts and try to get this out tonight....

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.