The early days of enterprise mobile app development focused on creating a functional experience and getting it out the door quickly, leaving "quality" as a problem for another day. App performance is an example of how mobile changes quality assurance. Performance is a key pillar of quality that AD&D pros often overlook in their race to market; this report dives into the problem areas that impede mobile performance, and provides guidance on this not-so-black-and-white dimension of quality. This is an update of a previously published report; Forrester reviews and updates it periodically for continued relevance and accuracy.