I have never had a problem with my mid-2010 15" MBP since a couple days ago when I noticed that I will get the spinning beach ball once every few minutes, lasting about 5 seconds each time. It was happening often enough that I started getting worried that something was going on. This happens when opening new applications or switching between applications. I have 4 GB of RAM, and at first I thought it was an issue with that, so I bought 8 GB which is currently being shipped to me to see if that helps. However, when I quit a lot of applications/restart and my Activity Monitor shows plenty of free and inactive RAM, it still happens, though not as often. Here are some screenshots: This is last night, when it was happening a lot to me in the span of a few hours, and eventually the Page Outs piled up a lot more: When I switched to the Disk Activity tab I noticed that each one of the spikes is when I get the spinning beach ball (or is it AFTER each spike and thus when it's at 0 indicating nothing is happening i.e. freezing?): And here is a copy of my Console as of a little bit ago, notice all the errors: Can anyone give me some advice on what to do next? Clean install Mountain Lion? I made a Time Machine back-up this morning too, just in case.