I render from the back to the front in layers. Save the PZ3 first. Now when ever you click to open the PZ3, every thing is exactly in place including lights. Now all you have to is render with less figures. Do it in sections. Tricks like render the scene with no figures for the Main background. Add a few figures, render those in the scene, you can get thier shadows working. Close Poser then open PZ3 again and render the other figure in scene. I render my figures without clothes and hair. Then render new layers with clothes and hair. All this helps poser render. I save everything as a tiff. You should see how big and how many layers I have in PSP. I also work form the back to the front in PSP to cut down on the size and import layers as I go along. That's one of the reasons I love HMANN hair's. I can render all the parts individually. Better efect and no poke throughs.