I bought myself a early 2015 13" MacBook Air last year around black friday. I was moving over from a mid-2012 13" classic MacBook Pro. Both used with the public releases of El Capitan. I set up the the new Air as a new computer instead of migrating my previous setup. I thought everything would be smooth as silk except for the fact that whenever I open System Preferences it bounces for what appears to be an eternity before it opens every time and in the last two weeks I have started to experience dropped frame rates at random times when either scrolling, moving between open Windows or desktops in Mission Control. It's driving me insane because my old MacBook Pro don't exhibit these problems at all and it's also running El Capitan. Has anyone else experience these glaring issues and if so how have you been able to solve them? I have already tried a reinstall of the operating system and the problem still occurs.