Ever since I updated to 10.11.6 (I believe that is the current version), websites that used to run smoothly end up freezing and I have to close the tab or if I can't, manually kill the process in Activity Monitor. Needless to say, ever since I updated to Yosemite, I noticed my machine takes 5-10 longer to boot up and it doesn't run as fast as it should. I know it's only 4+ years old but I'm already thinking about upgrading to the new Pro (whenever the hell it comes out). Anyone else notice slowdowns with Safari, or any other application with mid-2012 MBA? I sure do.