Shouldn’t all interactions be instantaneous?
Why wait for the app to do what it wants.
“give the Instagram user a feeling of responsiveness, even when someone’s phone is trapped on a lousy connection.

  1. Instagram Always Pretends To Work
  2. Loading Content Based On Importance, Not Order
  3. Anticipating The User’s Every Move”

http://www.fastcodesign.com/1669788/the-3-white-lies-behind-instagrams-lightning-speed