I just (finally) finished upgrading to Leopard after several false starts (I ended up needing to do a clean install and restore my user folder using the .Mac Backup app). Of all the MacOS upgrades I've done over the years (OS 8, OS 9, OS 10.1-10.4) this has been by far the worst. I have to say I'm flabbergasted with all these reports of Leopard running so well on older G4 machinesincluding machines much less powerful than my 12" Powerbook (circa 2005, 1.5ghz. 1.25 RAM, 64 MB GeForce Go5200 graphics). Tiger ran beautifully but Leopard is choppy and slow. I'm just frustrated all around. I've done a clean install, repaired permissions and zapped PRAM. I'm seriously considering going back to Tiger because this is just ridiculous. Is anyone else in a similar situation?