That should be the problem. The hyperthreading is used to simulate the two processors, but the problem is that Poser 5 is only compatible with a one processor machine. So with a dual processor unit, it will only look like half (one processor) of the machine is doin any work. I sure hope that the next version of Poser has the ability to thread itself out, it would make it 100% quicker. You also have to remember that with almost any 3D rendering software, the bottleneck is the CPU speed and the amount of RAM available. Even with a 3 GHz box with 2 GB RAM, I still run into a bottleneck. There is so much processing happening, that there is always a slow-down somewhere and even with tons of RAM, Poser still requires Virtual Memory. Nothing pins a CPU more than a render job. THe only way I have found with any 3D program to speed it up is to ensure that it can do network rendering and than set up a cluster that acts as a multi-processor unit (as many as you can attach).