Before you do any resizing, I think you should test assumptions. When the CG lore tells us something, it sometimes doesn't apply. It all depends on how the app behaves.

I am certain that Poser 6 does this differently than 7. And 7 may do it differently than 8.

An honest comparison of a facial closeup at very large render dimensions (> 2K pixels) may show that 4000 versus 4096 is no different in results or performance. I think it isn't.

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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)