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iOS 26.4 ― Bug Fixes, Changes, and Improvements

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The first post of this thread is a WikiPost and can be edited by anyone with the appropiate permissions. Your edits will be public.
gardiboy said:
This is the most disgusting release of iOS. Lots of app restarts and home screen animation lags! Notice this happens only on the 17/Pro model. On the Air its buttery smooth! This is a freaking 12GB RAM device acting like a 4GB RAM. Totally disgusting user experience.
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It's equally stuttery on my 17 Pro Max and on my Air to be honest! Something is really off with this build. 🤔 😕
 
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Cobold said:
It's equally stuttery on my 17 Pro Max and on my Air to be honest! Something is really off with this build. 🤔 😕
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If they cant fix this in 26.5 beta, gonna giveup.

hows the performance on the Air? I have both devices and the Air is substantially better. however i feel something is really off in this version. like there is some memory leak!
 
James6s said:
This public release of 26.4 is running worse than the RC on my iPhone 17! Having random stutters & millisecond freezing. Eg - times when swiping to unlock/close apps to go to Home Screen with a slight delay and then very choppy loading the apps, having random app redraws.
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Yeah, the same is happening to me. I thought it was just me regarding app redraws but looks like it's not only me problem. I use 17 Pro with 12GB of ram and apps reload more often than on my 13PM with 6GB of ram on iOS 17...
The overall smoothness is also worse compared to iOS17. I can see stutters in some first and 3rd party apps on iOS26 but im not seeing them on iOS17 🙃
MCKLMT said:
Update again with the ipsw it can help. 🤷🏻‍♂️
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It can, but not always. I only update my phone with the ipsw and unfortunately im having the same problems.

It's just iOS 26 and it's pathetic optimisation. Actually not only iOS but also other operating systems. My watch on OS26 is laggy and battery life is atrocious. Charged to 80% at 11pm yesterday, right now it's 1pm and it's down to 26% - by just being on my wrist, no workouts or whatever and no always on display 🤷🏼‍♂️
 
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Churchman said:
I resolved to keep OS18.3 on my 13mini until the advent of at least OS27.

But my phone started random glitching.

So I finally gave in and upgraded to OS26.4.

Gotta say … it’s not awful. Which is to say it’s OK so far. I have noted a number of really obvious and irritating user experience choices that Apple has made… to which a rational person would have said in the dev and UAT stages, “don’t code it that way.” They are very irritating but not deal breakers. And I will say that beyond the recent glitch prone nature of 18.3, I had not ever had many OS irritations with iPhones. I will just hope they are resolved in .5, .6, etc.

So 18.3’s glitchiness is gone and I’ve got nice stability in normal web use. And, the most shocking thing is, this 13mini now flies. FLIES, I say. It zips through everything like it’s running an M5 chip and a better modem. In this regard, it feels like I have a new phone. Not a new 13mini - no. Feels like I have a new 16 or 17e or such.

The only regret I have is that this OS sucks battery 3x or 4x faster than 18 did. A new battery is cheaper than a new phone…. Such is life.
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Tempting, but still a hard pass for me & my 13 Mini due to multiple posts of CarPlay connectivity issues with new iPhones & your battery sucking "3x or 4x faster than 18 did."
 
cigz said:
Yeah, the same is happening to me. I thought it was just me regarding app redraws but looks like it's not only me problem. I use 17 Pro with 12GB of ram and apps reload more often than on my 13PM with 6GB of ram on iOS 17...
The overall smoothness is also worse compared to iOS17. I can see stutters in some first and 3rd party apps on iOS26 but im not seeing them on iOS17 🙃

It can, but not always. I only update my phone with the ipsw and unfortunately im having the same problems.

It's just iOS 26 and it's pathetic optimisation. Actually not only iOS but also other operating systems. My watch on OS26 is laggy and battery life is atrocious. Charged to 80% at 11pm yesterday, right now it's 1pm and it's down to 26% - by just being on my wrist, no workouts or whatever and no always on display 🤷🏼‍♂️
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Yup its ios 26.4. Hope an update is out soon to iron out these mess. its a wreckless mess
 
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jdavid_rp said:
I must be so lucky with my iPhone 15 and my moms iPhone 13 or people here tends to hyperbole the issues…
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People do have a tendency to exaggerate when they’re frustrated.
Public release is a tad smoother on my 17P and is also keeping apps in memory better compared to RC.
Memory management was fine with 26.3.1 but took a tumble on 26.4 RC while being almost buttery smooth.

I did DFU restored to 26.3.1 a couple weeks ago and OTA’d to both RC and then to final. That could’ve helped too.
 
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gardiboy said:
If they cant fix this in 26.5 beta, gonna giveup.

hows the performance on the Air? I have both devices and the Air is substantially better. however i feel something is really off in this version. like there is some memory leak!
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I also own both devices. For me, the 17 PM and the Air perform euqally BAD with 26.4!
I am seeing the exact same stuttering when closing an app and immediately start swiping to other homescreen pages. I mean - it's a pretty basic and common thing to to: close one app, swipe to another homescreen to jump to another one.

WHY IN HELL does no one within Apple notice this??! I mean - performance wise 26 has never been that great. But this REPRODUCIBLE stutter-fest while just swiping your homescreen pages hasn't been present in 26.3 or any other 26 before.
I think they introduced that stuttering in 26.4 beta 3. I went throu all betas on my 17 PM and I think it was b3 when it started to stutter.

My Air has never seen any beta and was buttery smooth on 26.3.1 - just until yesterday when I updated it to 26.4.

It's a pity. 🙁

EDIT: But it's not just the 17 (A19) series:
My wife's 16 Pro Max (A18 Pro) does exactly the same stuttering as my 17 PM and Air, also perfectly reproducible every single time.
 
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Cobold said:
I also own both devices. For me, the 17 PM and the Air perform euqally BAD with 26.4!
I am seeing the exact same stuttering when closing an app and immediately start swiping to other homescreen pages. I mean - it's a pretty basic and common thing to to: close one app, swipe to another homescreen to jump to another one.

WHY IN HELL does no one within Apple notice this??! I mean - performance wise 26 has never been that great. But this REPRODUCIBLE stutter-fest while just swiping your homescreen pages hasn't been present in 26.3 or any other 26 before.
I think they introduced that stuttering in 26.4 beta 3. I went throu all betas on my 17 PM and I think it was b3 when it started to stutter.

My Air has never seen any beta and was buttery smooth on 26.3.1 - just until yesterday when I updated it to 26.4.

It's a pity. 🙁

EDIT: But it's not just the 17 (A19) series:
My wife's 16 Pro Max (A18 Pro) does exactly the same stuttering as my 17 PM and Air, also perfectly reproducible every single time.
Click to expand...
Trust me I went all out to try to troubleshoot this issue. To do a full erase and reload the IPSW from Itunes and without restoring from a backup. The issue still persists. I guess its not just the home screen swiping lag but the frequent reloading of apps is totally unacceptable!
 
At this point, I am honestly hoping Apple has dedicated 10% of devs to fixing and tweaking the mess that is iOS 26 and dedicated the other 90% to iOS 27 in order to fix Dye’s leadership mistakes. If current leadership doesn’t fix the issues along with making iOS glass look as good as MacOS glass (WHY is there such a difference in quality?), I legit might run an iPhone XS for a while to escape iOS 26+. I can’t believe how much I miss the stability and the lack of constant visual glitches we had on iOS 18.

Also, NONE of my iPadOS 26.4 touch/click points line up with the actual button. They all highlight off-center when I hover the cursor.
 
Was comparing Gemini - Air vs S26 Ultra.
I was surprised at the difference.

On the Air, Gemini answers are more like an intelligent high schooler while on the Ultra much more college level or above. Doing topic lookups.

Looking at settings on each but finding nothing that would cause this disparity.
 
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spartan1967 said:
Tempting, but still a hard pass for me & my 13 Mini due to multiple posts of CarPlay connectivity issues with new iPhones & your battery sucking "3x or 4x faster than 18 did."
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Totally understand.

I only updated because 18.3 started misbehaving badly.

Note: I use my phone very differently than most people. My phone is empty. No non-Apple apps. No music. No photos or other media. And I have removed a lot of Apple apps. All my gigs are unused except for what the OS needs. Next, I only use my phone as a phone, to read a lot of content online, and as a hotspot for my pad and MBP. I said that because I am guessing my persistently empty phone plus the inherent OS optimizations have impacted why my phone seems way faster with this update.

Mostly, I am not as perceptive of a lot of OS26.4 issues as a lot of others. But … But, I am put off by random white screen flashes in screen transitions… occasional white text on top of white text when scrolling, making either text illegible… some stuttering and some millisecond freezes when it feels like the phone is thinking or processing before it finally continues what it is doing.

Those issues irritate me.

But they are not ever-present and always in my face. I notice them 2x or 3x a day for a second before moving on. My feeling is that the Apple software standard is to deliver OS mediocrity now with fixes that will be released… eventually. So I wait for a fix. I am OK with that for now.

The trade off for me:
- OS18.3 gave me bad glitches that made me hate the phone….
- vs OS26.4 giving me white screen flashes / text on text (bad but ignorable) and battery issues (also bad but my battery was going bad in 18 and needed replacing anyway so that’s a wash) … and gave me the awesome speed increase, solved the 18.3 glitches, and provided other benefits in my 13mini that are good and that makes my phone feel new and very desirable again….

I can live with the 26.4 irritations. For me 26.4 is not as bad as I thought it would be. I have been given goodness that exceeds the suck. So I am OK for now.

>My experience does not guarantee any other person’s results.<
 
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Artemiz said:
You can turn those off by enabling Accessibility-> Display & Text Size -> Reduce Bright Effects
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Thanks!

But this strikes me as really bad.

To me the white flashes are bad and represent a bug in the code.

You said I can turn off the white flashes! So the flashes are not a bug!?!? They are a feature!?!?

If true, Apple software and software product planning really sucks.
 
James6s said:
This public release of 26.4 is running worse than the RC on my iPhone 17! Having random stutters & millisecond freezing. Eg - times when swiping to unlock/close apps to go to Home Screen with a slight delay and then very choppy loading the apps, having random app redraws.
Click to expand...

Try force restarting your iPhone first and if it does not help - reinstalling via IPSW. Should take you about 15-20 minutes with a fast Internet connection.
 
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For me 26.4 PR seems to be working as well as 26.3.1 on iPhone 17. For people with app stutters and reloads, do you have Apple Intelligence enabled? Could it be the cause, as mine is switched off?
 
one more said:
For me 26.4 PR seems to be working as well as 26.3.1 on iPhone 17. For people with app stutters and reloads, do you have Apple Intelligence enabled? Could it be the cause, as mine is switched off?
Click to expand...
Apple Intelligence was never on for me, same for Adaptive Power. Both on the Air and 17 series, apps refresh more frequently compared to 26.3
 
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