"What it does is render the whole screen at a different resolution, say 1920×1200, and then scale it up, using the graphics hardware, to 2880×1800! This means e

"What it does is render the whole screen at a different resolution, say 1920×1200, and then scale it up, using the graphics hardware, to 2880×1800! This means everything gets blurred. I.e. I get less crispness than a native 1920×1200 display would give me." No, it does nothing of the sort. It renders the whole screen at 3840x2160 and scales it DOWN to 2880x1800. As a result everything designed for retina is razor sharp. Everything that is standard resolution is blurry, but no more so than when running at 1440x900 equivalent. I run 1920x1200 equiv. on my rMPB all day. I even run Adobe CS6 on it. No problems. Seriously, all the complaining I've heard about "unusable" Adobe products on this machine are bunk. It hasn't effected my photo editing, or page layout work even a tiny bit. I don't use MS Office much, which is indeed blurry at any resolution, but LibreOffice is sharp.