having that Rage Pro 128 isnt helping things either. i would at least recomend a geforce 2 card and above, but you will still be pushing it. but since that has AGP 2x a 6200 Wang AGP card (flashed of course) would perk things up a bunch. if you was to get a better video card and max the ram out then leo should run ok on your system, but that will leave you with the CPU being the holdback

the rage pro 128 didnt have that great of support in OS X anyway let alone in leopard.

my DA G4 533 with geforce2 AGP and 768 runs leopard just fine but still not ideal (just a tad bit slower then tiger in some spots, and faster in others), but i think that would almost be the minimum. a dual cpu would be ideal if your running leo on a older g4, plus all of the ram you can fit into it will help it out allot as well.

i want to find a dual 533 for my DA then leo should run better then what it does now.