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I could be wrong, bit I don't think the rooms in Poser add that much overhead to resource usage, unless you're actually using them.

The Cloth room, for instance, doesn't utilize the processor and ram when it's not calculating a simulation, for the very reason that it isn't doing anything.

Talk Designer doesn't slow P7 down, the only thing that's really a feature that slows Poser 7 down is the Undo option. Having 100 levels of undo that get written to with every change to something in the Preview Window does slow Poser down, but you can lower than number and regain at the least the same responsiveness that P6 and earlier have.

I find it interesting that you've labeled Poser 7 a resource hog simply based upon people talking about how much of a drag the P7 roadster is to use.  The issue with the car isn't with Poser and the features built into it, it's with the mesh of the car. You'll find the same problems with it (if not worse problems) trying to load it into an earlier version of Poser.

P7 isn't a horrible resource hog, no more than P6, and IMHO, it's much better at actually using the resources many modern computers have, like multiple processors and more than 1 Gig of RAM.

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If you're joking that's just cruel, but if you're being sarcastic, that's even worse.