Even if you get DSON working properly, there are many threads on many boards with folks talking about how well it actually works. I have an iMac with 8 GB of RAM, and I have found I can only use two Genesis 2-based figures at a time, and unless you turn subdivision off, performance is glacial. But you can go the CR2 route, which is what I have done. You convert DS figures, clothes, etc to Poser native ones that have no slow DSON overhead. You can still use DSON for poses, expressions, etc. My experience leads me to recommemd that You buy Netherwork's Creator's Toybox. It tells you exactly how to do that and cleans up the files for you. It takes some time, but boy is it worth it.