Hi. The Galaxy scene is a tad slow I know - its a simulation of particles with gravity. The problem is it uses the CPU lots, not the GPU. Because its using R4's scripting lots it kills it. a better VM for scripting would solve a lot of stuff - I may attempt to produce a ultra fast VM in future, but it'll slow down load times yet more.
Looks like your P4 is acting a bit sad though. I'd check that water cooling is working ok... Galaxy runs around 50fps on my XP2400. It doesn't even need a fan on the heatsink
