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When you scale down a subpixel-rendered text that way, you pretty much destroy the subpixel rendering effect.

What I think happens: in modes other than 2x, text is rendered without subpixel rendering. It is scaled down, and possibly a slight sharpening effect is applied in the process. Anyway, the result is not as good as the awesome font rendering we are used to in OS X.

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Text on rMBP at "1920x1200": http://i.imgur.com/FAemY.png

I figure that what it does it use the actual rendered pixel grid for subpixel calculations.

Is that in a "Retina app"? If so, my understanding is that text for them is rendered by the system at the right size (so not rendered then rescaled) at any resolution.

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