What can throw the results off is if you render twice without quitting Poser as it appears you now have the textures in cache

MacOSX 10.5.6,  Quad Core Intel Xeon 3 ghz, 16 gigs of 667DDR2 Ram, 8 cores, PoserPro,  4 threads, render as a separate process checked.

First render in background 2:03
Second Render Internal 1:01 (did not quit between renders)
Third Render again in Background 0:58 (did not quit between renders)

Quit and restart Poser
Fourth Render Internal 2:21
Fifth Render again in Background 0:58 (did not quit between renders)

After a fresh launch of Poser, it takes about half the Render time just loading the textures.

Gary

"Those who lose themselves in a passion lose less than those who lose their passion"