https://www.cnet.com/news/apple-ios-11-2-update-faster-wireless-charging/

Apple's latest iOS update makes wireless charging on the iPhone 8, iPhone 8 Plus and iPhone X 50 percent faster. 

Currently the three iPhones wirelessly charge at a rate of 5 watts, but the iOS 11.2 update allows them to charge at a rate of 7.5w, which is a 50 percent increase. The charging update was spotted and tested out by MacRumors.