I commented in another thread about the spinning balls I see on a regular basis since installing 10.8 and got into a discussion about Mountain Lion memory management. I have 4 GB of RAM installed. This morning I started my computer with Activity Monitor running. Without any active processes I had 800MB free memory. I got up for coffee, came back, and free memory had dropped to 240 MB. I decided to use the Terminal 'Purge' command and it jumped up to 2.17 GB. Obviously, I don't get it. I've been told that when it needs to, OS10.8 will release memory for other uses. I've got to figure a way to systematically check this assertion. I'm thinking that if I let it go until 'spinning ball' time, and keep the terminal open, or get that program SmartMemoryCleaner, if I have an opportunity to use these programs to free up memory, it would indicate that 10.8 does not manage memory as well as it might? Thoughts? What is the significance of Page Ins and Outs? Also is there a way to manage Virtual Memory and more importantly, is there an advantage of doing so? Regarding SmartMemoryCleaner, does it do other stuff that the Terminal Purge command does not do? Thanks!