There are a lot of improvements on the next iOS 9 update. One of them is on the battery life. Compared to the current battery life size, after you have installed iOS 9, you will get an extension 3 hours of battery life on your iPad or iPhone. On top of that Apple is reported to turn off the features which use bigger power such as sensors and push notifications so that it can save up some battery.
Some of you might be wondering how Apple does that. Apple make it possible by a known method called processor throttling. It is a process to regulate the rate which the application processing is conducted either statically or dynamically. HTC has also used this method on its flagship smartphone HTC One M9. The device is using Qualcomm’s Snapdragon 810 chipset which is reported to suffer from overheating. Unfortunately the side effect of it is that the performance was reduced.
However, it seems like it is not the case with Apple. Below is the result from MacRumors when it tested iOS 9 beta through Geekbench 3 for iOS, iPhone 6 plus multi core score fell from 2891 to 1751 when the Low Power Mode action is deactivated whereas the single core performance dropped from 1606 to 1019.
The side effect of losing a little bit of performance seems like not really a good idea. However, with a low battery life, it also makes other features such as the cores or RAM seems to be less significant. However, it seems like Apple manage to keep it balance. iOS 9 final version is expected to release in September.