I got it to run really fast on a p3. The trick is to use 1024x768 resolution @ 16bit color, disable aero, set computer properties visual effects to best performance, desktop theme to Windows Classic, no sounds, disable UAC / indexing service / iis / iishc / gadgets, limit startup apps in msconfig, set groups to none and make all folders like this, set always show icons never thumbnails, and disable automatic updates. I could probably get it to run nice on a p2 as well but I don't have one. The precious motherboard of that p3 has the serial and parallel ports needed along with ISA slot cards to communicate with our satellite equipment that controls satellites that are still in orbit and needed a way to run IE9 for apps we are developing for them.