Perhaps most importantly, Apple isn’t sitting on some secret technique to make retina images work well. Maybe they will provide better solutions in iOS 6. The way they handle images—downloading both sizes plus an additional HEAD request—may be the least efficient way to support retina displays. But for Apple, it likely doesn’t matter as much as it will for your site.
Passend zu den Gedanken von Christoph erklärt dieser Artikel wie Apple.com entscheidet wann Retina-Bilder auszuliefern sind und wie sie es anstellen. Apple kommt dabei eher schlecht weg.