The size of files reported in the library are of the file you're looking at. In the case of Alyson this is a crz file (compressed cr2). That is not Alyson's mesh or morphs - that's the file that causes those things to be loaded by describing all the other files that make her. Also, Poser files on disk are in text format or compressed text format, which has little to do with how much binary memory will be consumed by loading that object and all its ancilliary stuff.

If you have a scene that P7 can render and P8 cannot, then there is something wrong with P8. I have seen many posts about problems loading textures, so I have no reason to doubt that you've hit a snag. SM is working on SR1 that will hopefully correct this problem. (And many others)

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)