The resolution should be much sharper on the retina then on your old machine. However every thing should display about 1/9 the size display on you old display for the pisels on your new high resolution display are around 1/9 the size of pixels on you old low resolution 100DPI display. You can I believe set the Mac OS to scale what is displayed however you then not taking advantage of the high resolution of the display you running it as if it were a 100DPI display 9 retina native pixels will be used to create 1 100DPI size pixel.
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