Cory is correct about upgrading. However, you took a big step in jumping from the last version of Mavericks, V10.9.5, to the first version of the "somewhat problematic" El Capitan, OS 10.11. I would have moved up to Yosemite first, given how stable it is. As it is, there is (and has been, for about 2 months) a 10.11.1 upgrade that's in beta testing. It's never been clearly stated what issues that upgrade is dealing with, but it is sure bothersome that it came out about 6 weeks (or so) before the official release of OS 10.11 on September 28th. I actually am waiting for just one more piece of software to be upgraded for 10.11, Tech Tool Pro. But, even if it comes out, I am leaning towards waiting for the 10.11.1 El Capitan release before upgrading from the last version of Yosemite, 10.10.5, that I am using (and running very, very smoothly).