I've noticed that Mavericks seems to swap out to the disk when it doesn't need to - memory pressure is a low linear line, and I've got 6.03GB/16GB used, with 277.8MB of swap used. According to this article, however, Mavericks isn't supposed to use swap memory unless you overrun your physical installed memory by several GB's. Can someone explain to me why swapping to the disk is preferable to keeping it all in RAM? Even with a PCIe SSD RAM is still thousands of times faster in read/write speed and latency. I'm barely using my RAM and OS X is still swapping out to the disk. Thanks.