Resize a copy of the (5333x4000) texture to 50% in paint prog. Same for head. Inmatroom load new 50% to torso,,, new head to head. Save both to library,,, then double click them onto each part... If in P6 you can do a material save once you finish the switches. If you've got "big" hair, do the same ( turn off shadows and visible in RayT if possible). Set min. shading rate to 1.5. Max texture to 1024. Set bucket to 32. Hide anything NOT visible. Especially under clothing or out of scene props. Back in poseroom save new cr2 to library. Resave your scene and retry, or better yet do a shutdown of poser to clear the memory (it stores textures until it dies)