I've been using an iPhone as my main phone for the past two years, and a year ago I lost the Android I used for development. Sad sad.
The iPhone is supposed to be a fast one, it's a 16 Pro, which means it has a pretty powerful chip.
I had an old budget Android from 2016, the OnePlus 3, which is not nearly as powerful. It has a Snapdragon 820, which is about 8x slower than the A18 Pro.
I was able to hack my way back into my 2016 Android (kind of silly) and it's just blowing my mind how much faster this phone from a decade ago is.
iPhones use a lot of compute to dynamically re-arrange the hitboxes of buttons all over the screen, and there's a very noticeable input lag. You touch a box, it takes a long while to crunch, then it starts a very long sigmoidal animation. The long tails of these animations hide the initial delay before it starts at all, and adds vast gulfs of time where the interface can't be interacted with.
Whereas, on my OnePlus 3 with 0x animation scale, I just tap an icon and then it does the action.
If you want to do something like clean up your Apple Music library, you have to open the folder, wait for the folder icon to stop wiggling, touch the app icon, touch the app icon again because it registered the first input but didn't do anything with it, wait for the app icon to transition to being open, wait for the App icon elements to pop into place, press the bottom App icon shelf, wait for it to stop wiggling as the icons expand, scroll down the list of Library icons (which the screen can only display six of), press and hold the album cover, wait for the album cover to expand and wiggle into place, swipe up to bring the menu into view (but not too fast, since scrolling and swiping up to dismiss use the same gesture - it took me three times to successfully scroll down this menu), scroll down on the list of options (but not too fast, since scrolling and swiping up to dismiss use the same gesture - it took me three times to successfully scroll down this menu), press the "delete from library" icon which was hidden in the bottom of the list, wait for the next menu to wiggle into place, and press "delete from library". Then, it will wiggle downwards and fade, and the playlist icons will slowly and animatedly rearrange. Then you may repeat the process.
All the while, the iPhone fails to render this at even 60fps- it's really choppy and difficult to navigate as elements pop in and out, the screen shutters and flashes (unintentionally), and other elements flash and wiggle (intentionally).
If you want to do the same on a OnePlus 3, you do roughly the same process but every step is instantaneous and you can select multiple items at once. Nothing wiggles and flashes at you. Album images slowly load in, but I can excuse that, since it doesn't impact the UI, and they're being loaded from decade-old flash on a weak processor. Nothing wiggles or flashes.
I complain about this a lot but it's really crazy to me that, for most people, computers have been getting slower and slower for decades.
I have the cynical belief that very few people have UX principles, and Apple is something of a north star that people follow. This is a shame, since Apple's design philosophy is atrocious. Somehow, they convinced everyone that hamburger menus are atrocious, but have replaced them with finnicky gesture-based interaction flows with unnecessary multiple steps to interface with.
The people in Silicon Valley are some of the most insane out-of-touch people who have ever existed, and that is why iPhones are full of the most backwards Juicero shit imaginable.
A culture of design where the guiding principle is "turn off your brains and imitate whatever Apple is doing" was already bad. But now, we have machines that cement culture to be firmly stuck in the 2020s, allowing its users to turn off their brains and imitate others even more firmly than ever before.
And these are the portals between us and the rest of humanity!
tldr: Everything is Juicero.
Real TLDR: I got into my old OnePlus 3 and I'm amazed by how much faster my decade-old budget phone is compared to my 2024 flagship iPhone.