I was so proud in 2014 that our development team managed to pull a 60 FPS on iPhone 4. Built our own UI framework (before Unity rebuilt theirs), pulled images from network, assembled and updated sprite atlases at runtime and even created our own text rendering - all of it, in order to get 60 frames per second on 4 year old phone. And most likely, it still does, in 2020.

Since then, I've never worked in a team that would be so dedicated to perfomance. May be because that was a team that worked on a product with over 100 million installs that had all major features already developed - everybody else is too busy trying to figure out a market fit.