So that was pull, not push. Push notifications was exactly the solution to the problem of apps constantly pulling in the background. Sparrow couldn't do push be

So that was pull, not push. Push notifications was exactly the solution to the problem of apps constantly pulling in the background. Sparrow couldn't do push because they didn't want to have our emails on their server. Now that Google owns Sparrow, we can hope that they'll provide push. I wouldn't get my hopes up though :/