We explain how the Low Power Mode, one of the good news iOS 9. As its name implies, it is ideal for when you have 20% or less battery life you can gain up to 3 more hours of use by activating the feature.
Here's what Apple says about it:
Low Energy Mode temporarily reduces power consumption until iPhone can be fully recharged. When enabled, this feature disables or reduces the checking of emails, background updates, automatic transfers and some visual effects.
It seems that the company is not saying everything the resource does to save energy.
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Using the Geekbench 3 app that was recently updated and started to support iOS 9 (even though it is in beta), the MacRumors made two performance tests with an iPhone 6 Plus (which has an A8 processor), one with the feature disabled and the other with it enabled.
With Low Energy Mode disabled, test scores single-core and multi-core were 1606 and 2891 respectively; with it activated, the scores were 1019 and 1751, respectively, showing that there was a loss of processing. The same tests were performed on an iPhone 5s and the performance loss was more or less at 40%.
It all makes a lot of sense, after all if you decrease the processing power of a device, it consumes less energy and, consequently, saves battery. It remains to be seen why Apple does not report this in the feature description.
Still, it is great to have this mode available on iOS, something that the competition has implemented for a long time, by the way.