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Aug 4, 2015 5:56 AM in response to plindelaufby timmeh_gee,What @plindelauf has said is exactly the problem I'm having and exactly my observation. As soon as an external screen is connected to my 2011 Macbook Pro the graphics switch to the AMD Radeon HD 6490M. Once that happens it's not long before there is considerable lag when switching between applications and tabs. The UI animations, normally smooth are barely visible as the graphics try to at least render a few of the frames before the transition is over. Window dragging is also extremely laggy.
I don't recall this being an issue in versions of OSX prior to Yosemite. I have ticked all the boxes of the first things to try (reset pRAM, SMC etc) but nothing fixes it. I agree that a driver update from Apple may be our only hope. How do we get Apple Support's attention on this?