The steps to reduce background activity in apps are as follows:  Suspend activity when the app becomes inactive or moves to the background  Resume activity when the app becomes active  Resolving runaway background app crashes  For more detailed steps, refer to the official document by Apple. The link is provided below:   https://developer.apple.com/library/archive/documentation/Performance/Conceptual/EnergyGuide-iOS/WorkLessInTheBackground.html