Apps run with cache and creates space where they store their data in devices to be able to run perfectly, most apps run with cache or data while some runs with the both the main aim is to collect device functional information by assessing its hardware and storing data. some apps especially system apps are built or configured based on the particular device they’re to operate on having that close accessibility devices(smartphones) can’t operate fine without their system apps so at times low RAM or low CPU processing speed devices tend to lag when apps with heavy graphics are run on them, when this happens you either see a display on the screen saying “the app isn’t responding” or the device reboots. Whenever you see they app not responding display don’t always be in a heist to force stop the app, do click the wait button cause most people confirmed that their device hang or delays for a long time after the clicked the force stop button while it later open the app after the clicked the wait button. so always go for wait whenever and app isn’t responding in your device.