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Alternative title: “why do people keep updating almost the oldest supported device to a knowingly risky iOS version while STILL expecting like-new performance and/or battery life after nineteen whole iterations?”

When are people going to learn? Updating the oldest compatible device carries a massive risk AND it’s not reversible. At this point I’m beyond the point of siding with the user.

Update the oldest supported device to its latest supported version and you deserve to use garbage.
Apple should make sure those with old devices will still be a good experience. Take Liquid Glass and some of the other heavy elements out. You can still do some of the other stuff/features and ship it as an update.
 
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I'm keeping my 13 on 18.7.7 until I see what 27 holds. A family member upgraded their SE2 to iOS 26 against my advice and while it is usable, definitely more sluggish
 
Apple should make sure those with old devices will still be a good experience. Take Liquid Glass and some of the other heavy elements out. You can still do some of the other stuff/features and ship it as an update.
Apple will never do this. It’s time to stop hoping and expecting Apple to do better.

Liquid glass itself definitively proves that they do not care.

Update expecting device collapse and act accordingly, or stay behind. It’s time to stop blaming Apple entirely. The user shares part of that responsibility by now. People should know better by now.
 
I got an old XR on IOS 18 and it's noticeably smoother than my iPhone 12 on IOS 26. It's just constant lag.

Any idea why Apple even allows these older phones to upgrade to the latest OS if it's just gonna be a miserable experience? Is there an easy way to downgrade the iPhone 12 to a previous OS?

I know someone running 26 on a 12 pro max just fine.

The reason: security features. Slow but secure is better than fast and dangerously vulnerable.
 
I still bear a grudge about that to this day, and it's why all my devices are on 18.7.7. Ruined an excellent piece of kit, the 4s is to this day my favorite phone of all time.
I remember when the iPhone 4s with 512MB RAM received an upgrade to iOS 9 when it is almost unusable.

iOS 18 is bearable on 3GB and 4GB RAM iPhone models but iOS 26 should have been limited to 8GB RAM iPhone models.
the real crime was iPhone OS 4 being released on the iPhone 3G. Practically bricked it. And they left out the wallpaper feature lol because the screen didn’t meet their standards
 
the real crime was iPhone OS 4 being released on the iPhone 3G. Practically bricked it.
I can confirm that. I am still using my iPhone 3G (iOS 4.2.1 in Airplane Mode) as my daily alarm clock.
I love the form factor, but the lag is very high. (and the display really looks like crap compared to today's displays )
 
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To OP, @Slo Pesci iOS 26.4 shouldn’t lag on an A14 device. I have an A15 device with the same amount of RAM and iOS 26.4 is very smooth and battery life is good. Of course, I don’t have battery draining apps such as Instagram or TikTok. Maybe that’s the problem, some unoptimized apps?

My solution for your problem:

1) Make a backup of your content, preferably just the photos and documents in files app, and then, perform a clean install of iOS 26.4.1 doing a DFU restore using a computer and a cable.

2) If that doesn’t solve the problem, just wait for iOS 27 as all the rumors point towards a more optimized system, with many bug fixes and performance improvements.
 
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dream on, my iPhone SE 2020 using 26.4.1 shows no appreciable lag in the tasks I use it for, it is an a13 chip with 3GB of memory if I remember correctly so what is the particular problem
 
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Im running iOS26.5 beta on my iPhone 11 and from the .2 update forward its been a better experience than iOS18 was.

As a matter of fact, the .3 update on my 11 ran better than on my 15Pro.
 
Nice ROI. PS There is a way to downgrade it back to 3 or 2 (release version) if you were so inclined.
I can confirm that. I am still using my iPhone 3G (iOS 4.2.1 in Airplane Mode) as my daily alarm clock.
I love the form factor, but the lag is very high. (and the display really looks like crap compared to today's displays )
 
I got an old XR on IOS 18 and it's noticeably smoother than my iPhone 12 on IOS 26. It's just constant lag.

Any idea why Apple even allows these older phones to upgrade to the latest OS if it's just gonna be a miserable experience? Is there an easy way to downgrade the iPhone 12 to a previous OS?
Had a similar experience with my iPad Mini 4. Admittedly a very old iPad, but one which at one point ran beautifully and which is nearly unusable under the highest iPadOS it’s allowed to run.
 
Alternative title: “why do people keep updating almost the oldest supported device to a knowingly risky iOS version while STILL expecting like-new performance and/or battery life after nineteen whole iterations?”

When are people going to learn? Updating the oldest compatible device carries a massive risk AND it’s not reversible. At this point I’m beyond the point of siding with the user.

Update the oldest supported device to its latest supported version and you deserve to use garbage.
That’s a pretty f**cked up and cynical take.

You should be able to trust the device maker to not push out an update that slows down the device so much it is hard to use. The constant messaging from Apple and everyone else is “keep your devices updated” but then sometimes the update hoses your device? Very cool.

Apple can and does limit which devices can receive which updates. Apple also could probably figure out how to deprecate whatever features within an OS version are slowing things way down -- but sometimes they don’t.
 
I remember when the iPhone 4s with 512MB RAM received an upgrade to iOS 9 when it is almost unusable.

iOS 18 is bearable on 3GB and 4GB RAM iPhone models but iOS 26 should have been limited to 8GB RAM iPhone models.
iOS 26 runs fantastically on my iPhone 14
 
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26.4.1 runs fine on my iPhone SE 2020 and I just used it to code a new Health & Lifestyle app that shows no signs of the claimed lag. Many claims of slow iPhones are due to apps running in background and hogging resources. Keep the number of installed apps lean and remove all those just-in-case photos and older iPhones are still fine with iOS26.x. When it can't run iOS 27 or 28, I'll upgrade b/c I don't suffer from FOMO and don't worry about wasting a ms or two in a lifetime.
 
Alternative title: “why do people keep updating almost the oldest supported device to a knowingly risky iOS version while STILL expecting like-new performance and/or battery life after nineteen whole iterations?”

When are people going to learn? Updating the oldest compatible device carries a massive risk AND it’s not reversible. At this point I’m beyond the point of siding with the user.

Update the oldest supported device to its latest supported version and you deserve to use garbage.

But who decided to make it not reversible? Apple.

It sure would be nice if you could upgrade to a new version of iOS, see how it runs on your device, and then downgrade if it’s too slow. But Apple won't let you.
 
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I got an old XR on IOS 18 and it's noticeably smoother than my iPhone 12 on IOS 26. It's just constant lag.

Any idea why Apple even allows these older phones to upgrade to the latest OS if it's just gonna be a miserable experience?

I'm on an SE3 which has 4GB and one generation newer slightly faster processor. Works fine.

iOS 18 is bearable on 3GB and 4GB RAM iPhone models but iOS 26 should have been limited to 8GB RAM iPhone models.

26.4.1 working fine on 4GB SE3.

3GB of ram I could see being not enough. But my iPhone SE3 keeps up on the latest 26 just fine.

Agree. SE3 is working fine.

I am, however, having trouble on my 9th gen iPad, which is one more version back, an A13 Bionic 3 GB memory, and, of course, a screen with more pixels. So, that is kind of where the performance inflection point is. Note also that upgrades are a hassle with "only" 64GB Storage, another reason to stop updating before 26. I had my reasons for doing it, but, it definitely is a stretch.
 
iOS 26.4 23E246 is the only signed IPSW for the iPhone 12, so no downgrade is possible.

To kind of answer the other part of your question: the EU now requires at least 5 years of smartphone OS updates. That was up in October 2025, but I guess Apple wanted to put out one more update so they wouldn't get in trouble for cutting it off in September? Not sure they care about EU fines anymore, but someone at Apple made the decision to release it. In fact, iOS 27 this year MAY still be available for the 12, because even though the 11, 12, and 13 are all going to be 5 years or older, the SE3 with the same 4GB of RAM is only going to be 4 years old, so should continue to get updates. I don't recommend it though. These OSes were designed for new phones with 8-12GB RAM. It reminds me of Horrible Bosses: you can drag race in a Prius, but you won't win much.
That is pure speculation. Who said that that requires Apple to ship the new and redesigned iOS 26? It would comply with the requirement just shipping security updates to iOS 18 or even iOS 17, which it already does.
 
An individual devices battery might be in worse shape, and when unable to deliver peak power, now that cutting off entirely like happened on the iPhone 5, it just throttles right down to cope with demand. Most likely the case unless everybody here with a 12 comes out of the wood work to say they feel somewhat similar.

We had a friend using a 4S in 2014/2015... now that thing was slow on its last supported iOS'
 
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