http://www.renderosity.com/mod/forumpro/showthread.php?message_id=2788648

You can also run your .obj files through STOMP

There is a short tutorial in this thread that shows how to use it. Very easy. Basically what it does is defrag the geometry file or something like that.

Also, as someone else suggested, reduce the size of your texture files.  I use "Bicubic Resample" when I resized mine.  I am working on an older desktop and the texture sizes of so many files were so huge that I ran out of memory sometimes before ever having loaded something. I was stunned to see some files 5000 x 6000 !!!!   And some of those only had a small pair of lips in the middle surrounded by white.  I've been resizing all my texture files as I use an item to 1024 on the longest side and noticed a huge increase in my computer's performance.  I save the originals to another folder in case I ever need them again.  I'm a hobbiest so I don't need the huge detail that a texture of that large a size affords. If I had a better computer I probably wouldn't care so much about texture size, but for the time being resizing works.  Make sure to use "Bicubic Resample" so the image isn't blurred after resizing.

Another thing is the lights.  If you have Poser 6, really start working on getting used to IBL lighting.  That combined with one or two other lights will really help you.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi