"Test under adverse device conditions (iOS) - Xcode Help"

`` Test your app on a connected device under a variety of device conditions while you profile your app. Enable a network device condition and measure app metrics, such as time to launch the app, time for a user to sign in, and app responsiveness while fetching new content. To test how your app responds to changes in network quality, start an operation like streaming a video, and then enable or disable the condition. Enable a thermal device condition and test as follows: