I upgraded to Mavericks from Snow Leopard and I noticed a significant decrease in speed. Is there anything I can do to try to speed up my Mac? I know it's a common question, but it's the only thing I currently dislike about Mavericks is the measurable performance decrease directly caused by upgrading. Also, I had an app from the Mac App Store called RAM optimizer, specifically the lite version because it worked fine and it was free, but I think this is not compatible with Mavericks. It just won't open. Anybody have an alternative?