Engadget describes what Background App Refresh does on iPhone
Engadget says the setting can speed up certain apps when you open them because your iPhone refreshes them even when you're not using them.
TLDR
Engadget says Background App Refresh can speed up certain iPhone apps upon opening by refreshing them while they're not in use. Its guide also describes what happens when you turn the setting off and which apps work better with it enabled.
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