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May 28, 2020 10:05 pm

Why You Shouldn't Make a Habit of Force-Quitting iOS Apps or Restarting iOS Devices

Adam Engst, writing for TidBITS: Because force-quitting apps and restarting or shutting down devices are necessary only to fix unanticipated problems, there are two notable downsides to engaging in such behavior as a matter of habit: reduced battery life and wasted time. Why would these behaviors reduce battery life? Remember, iOS is a modern operating system that's built on top of Apple's proprietary hardware. Apple has put a great deal of effort into ensuring that iOS knows the best ways to manage the limited hardware resources within your iPhone or iPad. No one, possibly short of an iOS systems engineer armed with Apple's internal diagnostic and debugging tools, would be able to outguess iOS itself on issues like memory usage, power draw, and CPU throttling. When you invoke the App Switcher in iOS, you can swipe right to see all the apps you've used, possibly since you got your device. (The very first app in my iPhone 11 Pro's App Switcher is Apple's Tips, which I think came up automatically when I turned the iPhone on last year and hasn't been touched since. It's difficult to count apps in the App Switcher, but I probably have at least a hundred in there.) As the number of apps in the App Switcher should indicate, those apps are not necessarily running -- they merely have run at some point in the past. They're much more like the contents of the Mac's Apple > Recent Items menu. In normal usage, iOS devotes the lion's share of CPU and memory resources to the app that you're using. That's sensible -- the performance of that app is paramount. However, the next few apps in the App Switcher may also be consuming some CPU and memory resources. That's because iOS correctly assumes that you're most likely to return to them, and it wants to give you the best experience when you do. The screen shouldn't have to redraw multiple times, Internet-loaded content shouldn't have to update, and so on. [...]

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