But that bl**dy P7 car is a bad example, too. It's so ridiculously high poly that it's close to useless as far as I can tell (I haven't bothered loading it myself yet)

I've noticed that Poser 7 takes incredibly long time rendering reflections, at least if it ws reflecting materials made for Poser 6. But then again, Poser 6 flat out refused to render a pair of glasses I'd saved with Poser 5 refraction... So I guess there are a few backwards-compatibility issues at play here. Whenever I removed the materials on the glasses AND added them again from scratch in P6 I had no problems.  I suspect something similar is at stake with the reflection.

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.