I have Poser 8 linked to five Runtimes.  Poser 7 is linked to all of these except the new P8 Runtime.

(Sizes listed are libraries only.  I assume the library system doesn't consider Geometries or other Runtime folders.)

Poser 4 - 792 MB
Poser 5 - 682 MB
Poser 5 (backup Runtime, formerly on a separate drive, now on C:/) - 788 MB
Poser 7 - 1.47 GB
Poser 8 - 1.11 GB

I 've tended to assume my Runtimes are rather small, compared to many users.  I haven't loaded many freebies and I have very few items from the marketplaces loaded.  Are my Runtimes large?

I think there was some discussion in another thread (I'm not sure how to find it now), about the P8 library creating some kind of temp files or cache files, which had to be manually deleted.  I couldn't quite make sense of the discussion, and when I've asked about it since the response seemed to deal with deleting Undo function cache files, which I assume is a separate issue.  Does anyone know anything about the library creating temp files?  Could that be what I'm seeing?

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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.