App takes a lot to start if site is down or unreachable

This issue only needs to be tested in 1 device. IMO it's easier if this issue is tested by a developer. Modify a local Moodle site to make all WebService and AJAX calls take a few seconds to answer (e.g. 10 seconds). You need to change the endpoints:  /webservice/rest/server.php, /lib/ajax/service-nologin.php and /lib/ajax/service.php. In the app, add this site. It will take a while to load, the requests are blocking when adding a new site. Go to User account > Preferences > Manage downloads and delete all the data (to make sure there's no cached data). Kill the app. In the Moodle site, go to Site administration > Mobile app >Mobile authentication and set minimumversion to 4.1.0. Start the app again. Check that the app opens the main menu page fast (you aren't stuck in a grey page for 10+ seconds), but the main menu page will stay loading because it needs to fetch the main menu handlers. This will probably improve in the issue about cache priority review. Check that after 10 seconds aprox you see a warning saying that you need to update the app. Click any of the buttons. Check that the app logs you out after clicking the button.