Well even on a high powered Retina MacBook Pro it says that scaling options may effect performance so it wouldn't shock me if there is at least a small price to pay for this artificial 2208x1242 resolution scaled back to 1920x1080. That said, the fact that I'm seeing virtually no lag in apps optimized for the screen (most Apple apps, Beats Music, CNN, Vice News) and tons of issues in non-optimized apps my guess is that most of these quirks will get improved in the next 3-6 weeks as the most popular apps get updated for these new displays.
The fact that Apple has sold so many iPhone 6 and 6 Plus's only increases the urgency for developers to get moving and updating apps. I remember the hysteria when the 4 came out (antennagate, fuzzy non-retina apps and icons) and all ironed itself out in a month or so.
The fact that Apple has sold so many iPhone 6 and 6 Plus's only increases the urgency for developers to get moving and updating apps. I remember the hysteria when the 4 came out (antennagate, fuzzy non-retina apps and icons) and all ironed itself out in a month or so.