In a typical session with my RMBP I accrue a lot of page ins, some page outs, and some amount of swap. I'd like to understand what these mean. For example, currently I have 58 GB of page ins, 2.5 GB of page outs, and 7.9 GB of Swap used. Which one of these numbers is the best indicator for "lack of RAM"? What do the others tell me? Also, anybody have a clue why Apple is selling the high end model in the their retail stores only with 8 GB of RAM? The people working there tell me that it's because with the fast SSD RAM is much less important than it used to be. Clearly people here seem to disagree with this assessment. But why is Apple higher management not aware of it being an issue, if it is?