Hello, I have a late 2013 MBA and am now running the latest version of Mavericks (10.9.2). I have recently noticed that things get slow to respond, and I now see the spinning wheel much more often, especially while surfing the web; when scrolling down, changing tabs or typing (the typing is sometimes heavily delayed). I find this weird because going from my activity monitor, everything seemed fine. But then suddenly the memory pressure went yellow? I don't know much about this OS (or any other, for that matter). Can someone tell me if there's something I'm missing?