I use a 2015 MacBook Air connected with a 27" Cinema Display most of the time. Sometimes the MBA is a bit slow. Would the MBA run faster if I disconnected the external display and just run the internal display?
I figure painting all those pixels has got to be using up CPU. Or is the display controlled by separate hardware?
Just an idle thought here. I’m not even sure I want to disconnect the external display, even if it is slowing down my Mac.