Hello I have been having problems with my mouse and my browsing lately. My browsing lags meaning that scrolling down is often slow. Also when I want to change tabs on my browser from one page to another, it takes time for it to change. With that, my mouse has now began to stop working though I can move it around the screen, it doesn't allow me to do anything, like clicking, or even shutting down. I am sure it's a memory issue. In the PC world, we defrag or remove all temp files. How do I do that in a Mac? Thanks for your help.