Anyone have any issues? I just installed it on my G4 1.67ghz. On of my memory slots is bad, so I only have 512 megs. Tiger ran great, but I'm getting some lag with Leopard. When I click buttons I get a delay, sometimes I have to click them twice. Tapping the touchpad is slow to respond, sometimes I have to do it twice. Windows and the dock are a little choppy when moving around. I'm hoping this is just cause I have 512 megs. Anyone else having these issues?