Why did you mention 72 DPI? Is it your belief that has anything whatsoever to do with how much rendering has to be done?

Poser 7 is limited in its ability to use multi-core CPUs, and you probably have a good one. You didn't say which, but if you have 12 GB RAM then you probably have 8 or 12 cores to work with.

You need Poser 8 or Poser Pro 2012.

Meanwhile - tell us about the render. Are there reflections? Are there refractions (because of glass?) or transparency (because of glass?). What are the render settings? Are you using tons of lights like it's 1999? Or are you using IBL? Do you have an environment sphere? If so, what is the size of the image mounted on the EnvSphere?

Etc. etc. etc. There are easily two dozen things that could potentially be changed to speed things up, unless you are not using them - then changing them (and the explanations of how to do so) would be utterly a waste of time.

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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)