Screenshot included. Was checking out to see where all my RAM was going, though admittedly haven't seen any lag.. except in Safari but has ceased since the software update for the rMBP came out a few days ago. Still, I see Kernel_Task is hogging up the most memory and was wondering if any Mac aficionados suggest if I could do something about it. In 2nd place comes Safari Web Content. Am I safe to assume this is "WebKit?" I downloaded it a week ago cause Safari kept lagging on the page scrolls, but since the update this issue is gone. 3rd is Window Server, don't know if this is anything major..and 4th is Safari, which I would assume thats just the way it is.