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an_apple.a.day

macrumors member
May 21, 2010
44
59
Unfortunately this issue also happens in my regular iPhone 13 without a pro motion display, so that might be only one of the problems. @MagicMiguel also mentioned that he saw it on a regular iPhone 12 and iPhone 14.
i have 7 test devices and only the pro motion panels have shown the issue for me. they are all on 16.2 and no user data loaded into them, fully erased and minimal setup to get to home screen.
 

willdude

macrumors regular
Jul 16, 2010
243
187
Been away from this thread for a while since my 14 Pro had been fine since 16.2 RC. I never rebooted or force closed apps in the several weeks since then, and saw a stutter incredibly rarely. But the last 2 days it’s been happening frequently again. Very strange.
 

Radon87000

macrumors 604
Nov 29, 2013
7,777
6,255
Used to be iPhones were the pinnacle of smoothness but on ios 16, my 14PM is just as smooth as my S22U with frequent stutters and frame drops.
 

MagicMiguel

macrumors regular
Jun 22, 2020
127
211
what’s happening is an issue with pro motion displays and the variable refresh rate of the display not ramping down consistently enough when pushing an app out of high refresh 120hz into the home screens more static 1-10hz area. the animation stutters before dumping the app into ram. a firmware update would correct how the display enters a lower power refresh state from a higher 120hz active use app state.

this issue does not happen with iphone 14 (non pro) or any device without a pro motion or high/variable refresh rate display technology.
Unfortunately, this is not true. I also thought it was something to do with ProMotion, but it's not. You can go into the accessibility options and disable ProMotion and it will still happen after several hours. I have also seen it happen on my father's iPhone 12 (non-pro) and my wife's iPhone 14 (non-pro). Based on the fact that it doesn't happen at all for several hours after a reboot strongly indicates it is some sort of memory leak - probably something to do with the way it backgrounds apps because not only does this stutter happen on the swipe home animation, you will also see it when you swipe horizontally on the home bar to switch between apps.
 

MagicMiguel

macrumors regular
Jun 22, 2020
127
211
Installing RC now. Not holding my breath.
I installed it today as well but am not expecting it to be fixed. However, I did hear they fixed the bug where the fitness focus would not activate when you start an exercise from your watch. I'm also curious to see if maybe they'll fix the annoying squared notifications issue but not holding my breath for that one either.
 

FILIPSN007

macrumors regular
Feb 15, 2017
149
148
Czech Republic
I bought iPhone 14 Pro week ago and still nothing. I am on iOS 16.2.

I have to say that implementation of LTPO is bad. Sometimes swipes on homescreen between home pages is not smooth at all.

I found lots of places where Apple forgot implement ProMotion and animation is on 60hz etc dismiss of notification on lockscreen.
 
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MagicMiguel

macrumors regular
Jun 22, 2020
127
211
Also, the squared notification bug is still there. It makes you wonder if they even use their own products as their main phones. How would you not notice these bugs? If Steve Jobs were still there, iOS 16 wouldn't have even shipped with all of these bugs ;)
 
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usmaak

macrumors 6502a
Apr 13, 2012
972
808
Also, the squared notification bug is still there. It makes you wonder if they even use their own products as their main phones. How would you not notice these bugs? If Steve Jobs were still there, iOS 16 wouldn't have even shipped with all of these bugs ;)
Plot twist, all higher ups in Apple own the Samsung Fold 4. 🤣
 
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Bronnko

macrumors newbie
Nov 17, 2022
19
39
Still having this issue on my iPhone 14 pro 16.3 RC.
Apple doesnt seem to care about this bug nor the touch input stutter thats plaguing games.
What is Apple doing?
 
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WalsallSaddler

macrumors newbie
Dec 2, 2022
29
20
what’s happening is an issue with pro motion displays and the variable refresh rate of the display not ramping down consistently enough when pushing an app out of high refresh 120hz into the home screens more static 1-10hz area. the animation stutters before dumping the app into ram. a firmware update would correct how the display enters a lower power refresh state from a higher 120hz active use app state.

this issue does not happen with iphone 14 (non pro) or any device without a pro motion or high/variable refresh rate display technology.
Just look at this thread https://forums.macrumors.com/threads/12-pro-stutter-when-closing-apps.2263484/page-51

51(!) pages about this problem on iPhone 12 Pro — yes, it’s old problem, and happens not only on pro motion displays
 
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TimFL1

macrumors 68020
Jul 6, 2017
2,008
2,416
Germany
are you using any social media apps? i don't, and haven't seen the issue at all. wonder if it's a poorly optimized social media app. they're notorious for lazy optimization
It‘s not tied to a single app. It‘s an OS issue as it also happens with stock apps (Settings, Photos, Phone… I‘ve had ever app, including folders stutter).
 
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whadzinaname

macrumors regular
Jun 23, 2010
239
226
24 hours and no stutter on 16.3 RC on my 14 Pro Max. I am not holding my breath - it’s a matter of time before it will show up.
 

FrostLK8

macrumors member
Nov 12, 2019
63
44
Unfortunately, this is not true. I also thought it was something to do with ProMotion, but it's not. You can go into the accessibility options and disable ProMotion and it will still happen after several hours.

This is not the case though: you literally cannot disable ProMotion, it's impossible to do so. Limiting the frame rate to 60 HZ only limits ProMotion's range of movement to 1-60 or 10-60 rather than 1-120 or 10-120, it doesn't switch it off.

And fwiw, yep, totally agree that this is an absolutely humongous issue on iPhone 14 PM and on the M2 iPad as well.

I have 2 M2 iPads and games are unplayable on them, they stutter a hundred times worse than M1 ever did before OS 16 came out. You can see that it is ProMotion in this case because the stutter lessens a little bit when limiting to 60 HZ, and evaporates entirely when you put Screen Recording on which forces a constant 120 HZ (but this is not a solution because we can't just record everything we do and overheat the device just to make it run how it's supposed to to begin with).
 

FrostLK8

macrumors member
Nov 12, 2019
63
44
are you using any social media apps? i don't, and haven't seen the issue at all. wonder if it's a poorly optimized social media app. they're notorious for lazy optimization

Apologies for the double post, couldn't figure out how to add into reply above - but no, this has nothing to do with app developers, it's 100% Apple.

The bug is present in absolutely all games and FPS-sensitive use cases on the AppStore, it doesn't make a difference whether you're playing a 20 year old side scroller or a demanding MMO. It's persistent and present everywhere, and it isn't possible that it's somehow the fault of every mobile gaming company on Earth instead of Apple themselves. Particularly since it only appeared on iOS and iPadOS 16, and didn't affect said games and apps prior to that at all.
 
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