Misconceptions About iOS Multitasking
There is one iOS “tip” that I keep hearing and it is wrong. Worse, I keep hearing it from supposedly authoritative sources. I have even heard it from the lips of Apple “Geniuses” in stores.
All those apps in the multitasking bar on your iOS device are currently active and slowing it down, filling the device’s memory or using up your battery. To maximise performance and battery life, you should kill them all manually.
Wrong. Wrong. Wrong. Wrong. Wrong. Wrong. Wrong. There are caveats to this but anyone dispensing the advice above is clearly uninformed enough that they will certainly not be aware of these subtleties.
You’d already know this stuff if you’ve developed for iOS, but even then it’s worth a look.