Sorry, I just saw this now and I doubt you will see it 6 days later, but just in case: The main problem with that approach is (or at least used to be; I would

Sorry, I just saw this now and I doubt you will see it 6 days later, but just in case: The main problem with that approach is (or at least used to be; I would love to learn that it's changed) that the browser will still load the 1x image first. Since the large chunk of retina users are on mobile devices, that sucks.