I usually update only when major updates are released (12.*), but since this 12.1.4 update comes with the FaceTime security patch, I decided to update. So it's been 2 days since I updated, but I'm already noticing a big improvement in battery life (iPhone X, 100% battery health), and when I say improvement, I mean easily +1.5 hours more than what I was getting with 12.1! On the other hand, I feel that the phone is a little bit slower, not by much, but I can definitely notice that it's slower launching apps. Did anyone notice a similar behaviour?