6 Disable Background Processes
Background processes use up some of your iPhone’s RAM. But unlike the last tip, killing some automatic background processes for various apps will have a positive effect on your iPhone’s performance and battery life.
If your iPhone is sluggish, we suggest disabling Automatic Downloads by going to Settings > iTunes & App Store, and dialing all toggles under that header.
Similarly, disabling Background App Refresh by going to Settings > General and switching the toggle may help, too.