Hi all, I have a base Mac mini, with 4GB of RAM and no upgrades (see signature). I don't use photoshop or heavy applications but I watched a 2-hour movie online in full-screen last night and noticed after about an hour the playback was like in "slight" slow-motion and got a little bit slower. I was wondering would the lagging problem be solved by installing extra RAM, and if so would I be better off getting either the 8 or 16GB of RAM? Or is it because of the Intel HD graphics 4000? Thanks.