iOS 11.3 is a pretty major update, and one of its most notable tweaks is in response to one of the bigger PR controversies to hit Apple in recent times.

from https://www.theverge.com/2018/2/7/16984234/how-to-iphone-throttling-ios-11-3
https://cdn.vox-cdn.com/uploads/chorus_image/image/58605443/IMG_1112.0.0.jpg