I’ve noticed that button animations for Watch Topic, Search, Profile, All Categories, Hamburger menu etc. have a solid 0.20 second delay on iOS. I’m testing on an iPad 2 Air 2, iOS v 9.2, Safari and Firefox.
I compared to an Nvidia Shield tablet device where the animation is instant, like on desktop.
I’ll figure out how to do screen capture on these iThings if need be, but I’m hoping others can corroborate my report.