Install If You're Dealing with Performance Issues
iOS 11.2.2 could also have a positive impact on your iPhone or iPad's overall performance.
While they go unlisted in the change log, iOS updates have been known to iron out issues like severe battery drain, broken Wi-Fi connectivity, and busted Bluetooth.
The iOS 11.2.2 update could also fix UI lag issues, random reboots, lockups and freezes, and various issues with first-party applications.
Remember, iOS 11.2.2 also brings the bug fixes from previous versions of iOS. If you skipped iOS 10.3.3, iOS 11.1.2, or another version of iOS, you'll get those fixes with iOS 11.2.2.