HI, I just upgraded my machine: my old one is Unibody MacBook Pro 1st gen 2.4 ghz 4gb ram, 500 gb hdd , and running leopard, it runs fast and flawlessly. my new one Unibodu MacBook Pro 2nd gen (non removable Batt) 2.66, 4GB ram, 640 WD hdd, and running latest Snow leopard, problem: -sstem abit lagging eg. when i watch dvd and i want to turn up volume, some times when i press the volume up button (f12) it doesnt straight away change the vol nor shows the volume window, some times i mus wait about 1-2 second for it to happen, but not all the time , and i cant seem to replicate the problem -when i watch movies on my i tunes or podcast, some times it sttuters i dont know whats wrong . i tried formatting the HD and installing from scratch from SL DVD and still its the same. my older machine that runs leopard feels faster and snappier, is there any thing that i can do to solve this ? thank you.