Apple's new MacBook Pros feature automatic discrete graphics switching like NVIDIA's Optimus, but is based on their own solution and it turns out it may be a little bit buggy or just not working too well. When a MacRumors forum member discovered how to detect whether the integrated or discrete graphics, Engadget put this to the test and found out issues ranging from the notebook turning on the discrete graphics for applications that do not need it to the fact the notebook wasn't turning off the discrete when it wasn't needed.
engadget.com - But it gets worse. Viewing QuickTime movie trailers on Apple's site in Chrome (a buggy experience, by the way) bumps you up to discrete, but doesn't bump you back down after you're done -- only closing the browser and opening it up again seems to reset it. Firefox and Safari keep you on integrated graphics the whole time -- as does downloading 480p or 720p content to your local QuickTime player -- but pulling up 1080p video locally kicks you into high gear (this sounds closer to the correct behavior, at least).
Full article here.