It runs well enough on a Pentium III 866MHz processor w/ 512MB of PC-133 RAM in it, sporting a GeForce2Go w/ 16MB video RAM. The screen was also a 15" LCD (set at 1600x1400 resolution) XGA monitor (I tested it on my old Dell Inspiron 8100 laptop in case yer curious, and no major slowdowns at all.) Memory usage is pretty dang slim compared to Poser 4, esp. compared to P5, and even Vue... (seriously!) Startup takes about as long as Poser 4, but mostly because it looks through and refreshes content folders (which you can specify either during initial load where it searches automatically, or later on via the menu.) It also runs quite well on a P4m 2.4GHz box w/ 1GB of RAM and a GeForce4 w/ 128MB RAM :) /P