. Albrecht - I know how you feel <g> about lack of feedback, but that doesn't mean people aren't interested! I'm sure many (like me) download and render the formulas w/o necessarily commenting all the time; I don't expect everyone who downloads one of my animations to jump online and comment how awesome they are, (although I know they are awesome and just a little praise would not hurt...<g>). The multifractal formulas are way-cool; I have tried zooms and parameter animation tests but nothing worth doing (yet); also they take LONG to render. As for the question about FractInt platforms, I will repeat that an old Win9X machine is your best bet. Pentium-2,3 at 500-900 MHz or thereabouts. For current systems, I have found that WinXP itself isn't the problem - it seems to be the hardware a/o chipset configuration. Athlon64 chips are good, Intel not so good. I have and have had several systems over the years; the one I currently am using (Alienware Area51, purchased in 2006) has NVIDIA GeForce 8600, and AMD AMD Athlon(tm) 64 X2 Dual Core Processor 4600+ -15807.3 Mhz. It is the fastest fractint machine I have ever had - just click on the file in windows and it opens and runs in a command shell. Yet my previous WinXP Gateway system was absolutely unusable with fractint. With both of these I would boot up with a DOS 7.0 boot CD and run on a FAT32 partition. .