Exactly, Dizzi!
 
That's what a lot of folks don't understand. You can't slap 4096x4096 textures on every object in your scene and expect instant renders with hyper detail. Poser will render them but it'll eat up memory keeping maps that sized stored for the main character and the garbage can off in the distance and everything else between them. Map the objects according to their importance in the shot/image and you'll likely end up with the same result (sometimes better) - it'll be a faster render that's for sure.