I've used Norton products since 1995. Norton does not interfere with any of my software. On the other hand, all the Norton products have served to protect me from disaster, and have fixed many problems. One of the more dramatic aspects of Poser is bump maps. Poser 4 users need to convert bump maps from jpg to BUM. You could easily need to convert 10-100 bump maps in a single session, depending on what product you buy. That process takes time, and consumes lots of extra hard drive space. Poser 5 users get to use jpg bump maps. Oh, but here's a problem. Far too many products have bump maps plugged into the Gradient Bump map node, rather than the Bump map node. We need to fix that problem. Far too many artists or online stores don't recognize that issue, so we're forced to do the busy work ourselves. It's wrong to make a blanket statement that "Poser 5 is slow." I daresay it depends on your hardware and the subject you're working on. Poser users should likely have at least 1GB of memory, and give Poser its own large hard drive.