I have a gig of RAM in my system and I still have to stop every once and a while to close Poser and then re-open the test scene because Poser starts ignoring the updates after a while for some reason. I'm working the same way Tyger, I use the same test texture map name, saving it over and over so I don't have to tell Poser anything except Render. I've had as many as 30 layers in Photoshop at one time without too much problem.