I use a similar machine. Just allocate more memory to Poser (do a 'get info' on the application icon), and then bump up the Virtual Memory allocation in the Memory Control Panel. Things slow down, but it is the best way to render a complex image. The image I posted a few days ago 'Magnificant Millicent' was done with a Poser memory allocation of 240Mb, eventhough my G3 only has 192Mb of RAM.