: Go to Settings > General > Background App Refresh and turn it off to save system resources.
To make the App Store and your device feel more responsive on this older firmware: appstore ios 9.3.5
If you are rocking a legacy device (iPhone 4s, iPad 2, or iPad 3), iOS 9.3.5 is arguably the sweet spot for performance. It’s stable, it’s fast on older hardware, and it doesn’t track your every move like modern OS versions. : Go to Settings > General > Background
This focuses on helping people who are stuck on this version. or iPad 3)