Hello,
I have experienced this strange behaviour in Poser Pro (searched the forum for similar threads but found none):
I have a Core Duo 2, GTS8800, 4Gb and Poser Pro (set to use max number of threads) I was rendering a very large scene with IBL lights (rendering with a seprate process)
I opened the task manager and noticed that Poser Pro "idled" at 10-20% CPU usage for a long time, sometimes peaking up to 70-80% briefly, then back to 10-20%.
There is nothing else running save for Poser.
Both cores are working, but it's the overall load on the system that is low...

Is there some setting I am overlooking?
I thought I had learned everything I need from the replies to this old post of mine
http://market.renderosity.com/mod/forumpro/showthread.php?message_id=3255716&ebot_calc_page#message_3255716
...but I was wrong!

Thanks for help!