There's a school of thought which holds that OS X 10.10 Yosemite is optimized for Retina displays, particularly with respect to system fonts. Many folks using non-Retina systems complained, upon upgrading to Yosemite, that the UI was much harder on the eyes than Mavericks and earlier versions of OS X. (It's probably also worth noting that Yosemite is optimized for large amounts of RAM!)


dkmarsh—member, FineTunedMac Co-op Board of Directors