Aeneas: If your CPU is stuck at 50% during a render, I have to guess that your machine is using HyperThreading. Unfortunately, Poser does not thread out its instructions which leads to it only being able to utilize one of the two virtual processors. If you want Poser to use the entire chip as one processor, try shutting off hyperthreading in your BIOS. It is good to keep it on for when you are doing most things on your PC, so I would shut it off only when you are going to do a Poser render.