I’m a bit astonished to read so many negative experiences, and I wanted to share my positive one regarding the animations of the UI.
Keep in mind that I haven’t seen the “iPhone is indexing so it may be slower” message, maybe because I did a fresh install of iOS 18.1
Okay, my experience: iPhone SE 3, which has an A15 like the iPhone 13, 13 Pro and 14, and only 4GB of RAM. However I guess that the lack of Apple Intelligence gives my phone room to breath. Actually, RAM management is pretty good, with most of the already open apps being kept in memory even after a whole night.
Regarding the fluidity of the UI, in my case I haven’t experienced those stutters not even on the Settings App, which I do on Sequoia on my M4 Pro Mac mini.
The system feels snappy and responsive, and I’ve never been happier to update this early on the cycle. I’ve been updating my devices to the next major version around late spring to an already mature build, such as 16.6.1 and 17.6.1, but this time I really liked all the non Apple Intelligence features from iOS 18, so I jumped in this early and I couldn’t be happier, even with battery life.
Could this be a case where older/simpler devices like the SE3 (relatively good GPU rendering a relatively low resolution screen) behave much smoother than more advanced and powerful iPhones?