How much memory does your Mac have? My iMac (2 GHz core 2 duo) has 4 GB and I regularly see beachballs. I am running mail, safari, ical, quicktime, Xcode, address book, textedit terminal and mac journal. That is it. I am even closing stuff as much as possible and still it's beachballing and rattling about the hard drive. So how much memory does Lion need? If you are a developer, how much memory makes lion and Xcode comfortable to work with?