We know that the first practice to speed up performance of a site is to minimize the number of HTTP requests. The same should be true for mobile apps too, but the results I find from some of the apps I commonly use on my iPhone show that the apps have not paid enough attention to this practice.
Explaining “state” in “Hypermedia as the Engine of Application State” (HATEOAS) is a bit tricky, particularly when you have to do it under two minutes.