I'm running a Macbook Air (11 inch, Late 2010, 1.6 GHz Intel Core 2 Duo, 4 GB; 121 GB, NVIDIA GeForce 320M 256 MB) and I'm looking to upgrade to fix an issue I have. I run a more than a few programs at the same time - usually Omnifocus, Chrome, MSWord, NvAlt, TextExpander, Fantastical, TextExpander, Keyboard Maestro etc. I use Launchbar to quickly move back and forth between the apps. I notice that there is a lag in switching between apps. Is this a function of not enough RAM or a slow processor? Thanks!