16gb and you need more?? your ram had nothing to do with your sluggish performance unless you were encoding video whole playing a game while having 20 tabs open while watching youtube while watching japanese American and Brazilian porn all at once. Even then i doubt you'll need more ram.
I still have 4gb and I barely encounter any sluggishness.
4 tabs, not 20, and no porn open at the time. But I do encode and capture the game at times with music playing (many times on youtube) with my facebook, email, and a few other pages open. Never had a problem.
Anyways, right after I got home after work, the day of creating this topic, I said "bleep it" and reformatted the computer. It was almost that time anyways.... As soon as I finish downloading and updating all my Steam games, I will try and recreate the problem.
The funny thing is, what ever game I was playing at the time, Injustice I think, I cranked down the settings, and I still had the problem. Crossing my fingers that I fixed it with the format.