We are protective of our time, and with good reason. There are so many demands on it. We have so much to do. So much pressure. People hate to have their time wasted, especially online. We spend so much of our time online these days, and every interaction demands a slice of our time. One minor inconvenience on a website might not be much, but, accumulated, it is death by a thousand cuts.

This article touches on three of my favorite (an other) user annoyances:

  1. Page speed
  2. Complex passwords (and how we don' need them)
  3. Poor form validation

http://www.smashingmagazine.com/2014/04/25/stop-wasting-users-time/