You just installed iOS 27 and iPadOS 27, only to realize that the battery and performance completely suck. Here’s what is going on.
Indexing and Siri AI Preparation will Slow Down and Eat into Battery Life on Your iPhone and iPad After Installing iOS 27 and iPadOS 27, This is Completely Normal
First of all, whenever you install a new software update, it takes a while for everything to index properly. This can take up to two days, even more in some cases, and during this time period your iPhone and iPad will definitely feel slow.
Secondly, since indexing is a CPU-dependent task, it will eat into your device’s battery life too. If you’re noticing extremely quick battery drain, it’s completely normal and will fix itself in a few days.
Since iOS 27 and iPadOS 27 include Siri AI and new Apple Intelligence features, the device needs to index a lot of your stuff in order to give you context-aware answers. Unlike regular file indexing, this one takes a while, and some users reported that it took up to a week for index to finish properly.
So, it’s completely normal for a new update to offer poor performance and battery life in the first few days of use. Let the update settle in properly, leave your iPhone or iPad on charge most of the time to speed up indexing, and once done, you’ll be enjoying a super-fast and enhanced performance experience Apple promised with iOS 27 and iPadOS 27.
