I get terrible lag when scrolling albums if that's what you are talking about.It wasn't there on 8.4.1Apple Music app is horribly optimised and doesn't run smoothly on the Air 2. I'm not sure whether this was the case for iOS 8.4.1 as my Air 2 came with 8.3 preinstalled (which had the old-style music app) and I've only had it a few days so updating to 9.0.2 was the only option.