I currently have 4GB of RAM in my 2010 13" 2.66 GHz MBP and feel it lagging in some areas. Spaces window swapping lags at times, I get beach balls and Safari is fickle at times. Is there any way to see what programs are hogging my RAM? Also what is the maximum RAM I can put in my MBP and what brand should I go for? Thanks! Here's a screenshot of my RAM usage in Activity Monitor.