Hi guys. I've been recently dealing with this problem(?). I had little trouble with my 16GB RAM so I am currently using 8GB. After heavy RAM usage such as VMware, torrent, and even games, other application lags even when quitted. For example, after using VMware Fusion, my RAM is used up to about 7GB. I check my Activity Monitor and iStat and still says so. So decided to free up RAM by using "iCleanmemory". After I free up to 5GB, my computer lags for a while. Such as Safari not opening, beach ball, jumping icon for couple min, safari opens but page not loading, etc. I never understood why my MBP would be doing this. After couple min of usage, it goes back to normal. But its frustrating that I have to wait a while until using the internet or anything else. Is there a solution? Or is this natural occurrence?