Hi all. I ordered a new Retina iMac in December with the basic 8GB RAM, and would add RAM on my own. Added 8GB, all installed and recognized fine. However I have not experienced the performance bump I was hoping for. I am doing exactly the same things I was doing before, but there is no noticable speed bump, and I still get the spinning beachball too often for my liking. I find it hard to believe that, for what I do (surf, email, iPhoto, create text documents in Pages) that 16GB is insufficient. What might I be doing wrong? I do tend to keep several apps open at once, and 8-10 tabs open in Safari. Did I simply not add enough RAM? I was led to believe that 16GB of RAM for most (i.e., non video editing) purposes would be more than sufficient. Any insights would be most appreciated. I've enclosed a screenshot to help explain.