P11 (Pro?) "Reduce polygons" - reducing the number of polygons in a figure helps with the Poser preview screen refresh rate making it easier to add more figures to a scene before the UI grinds to a halt. There is also a "Combine Figures" which can also reduce the poly count by deleting hidden polys (eg figure + clothing). Useful for background figures.

Example with SF Kitty - 100% (80K), 50% and 25% poly count.