Basics: Macbook Pro 13-Inch, Mid 2010 (stock) 2.4 GHz Intel Core 2 Duo 4 GB 1067 Mhz DDR3 OSX 10.9.1 In the past few months, my Macbook Pro has slowed down considerably, and it has gotten to the point where it is unusable. A few examples: Starting Microsoft Excel for Mac takes 4-5 minutes Switching tabs in Safari while browsing MacRumors Forums takes 5 seconds (tab switches, blank white browser window, then the tab shows up. Page already downloaded, this is an issue of recalling it from system memory, I assume) Using Mail has become impossible as most clicks result in beachball or momentary lockup Clicking on a blank cell in a blank Numbers worksheet to begin entering data, it takes 5 seconds for Numbers to activate the cell to allow you to start typing, then typing is delayed, etc Generally speaking, system parameters don't seem to be out of control (see attached screenshots). I usually have Mail, Safari, iTunes (idle or iTunes Radio playing) open at all times. Then, I only have 1 additional application open for what I'm trying to do (Using Excel or numbers, iPhoto, etc.) I'm not sure what is going on. I realize that the notebook is aging, but I would think that I can switch tabs and use Mail (connected to my gmail) without much issue. Any ideas, or tools I can use to make sure that some strange background app isn't slowing me down?