I think you'll find if you disable your network access entirely at the OS level, then Poser will not attempt to access the net, and your performance loss - whatever it is - related to multiple-copy testing will be restored. But remember to keep Zonealarm running to correctly analyse Poser's contributory role in this - as ZA is a pretty heavy resource hog. (However if all you do is unplug the cable, then of course, Poser will still see a network capability, and attempt to use it.) So I wasn't saying remove the network to reduce the OS resource component, but in order to fool Poser into thinking you have no network connection to check out. But like everything else in Poser, you have to try it to find out what really happens... Either way I was only offering a suggestion to possibly permit the poster to further progress into analysis of an area in which they seemed particularly interested. I'm not interested enough to do the actual analysis for them! I have no other ideas on how else you can persue. Even if OSX doesn't do this what will that tell you? The variation caused by 2 different Poser builds, OS's and even system designs, has to wash out all other findings.