Hi Ted, As I said I use VPC 3 and 4 Window95 virtual disk on an iMac OS 8.6 ( G3 333mHz, 384 mb ram ) It work, not fast for sure and some equations make window freeze. Most of the time I used Tierazon or Sterling because they are fast generators BUT every generator I tried work, even Xenodream and Ultrafractal 2.05 but I remembre I had a lot of problem with ChaosPro. In my opignon VPC will always be an emulator with all the disavantage of it, but it served me well, with it I produce around 500 fractal images posted on different NG. If you already have VPC 5, try the demo version of Ultrafractal 3 you'll see the performance... A little advice use a Window95 virtual disk in my experience it make a big difference in speed versus other version of Window ( 98, millenium or 2000) Now that I have both computer I can't live without one or the other... ;-) Cheers, Luc