Aim for pages to load within 2 seconds.
If pages do not load within 1 second, a spinner progress indicator must appear.
Swipe down gesture must enable users to manually refresh pages, where information is regularly updated (Material.io) - see Touch Gesture Controls.
Loading Indicator Appears If Page Loading is Slow
Power Efficiency
Follow best practice app design to minimise battery drainage by the app.
The menu must include controls so users can turn off and on all non-critical features, that contribute to >5% of total app power use.