Does Apple intentionally slow down older iPhones with updates?

Apple has acknowledged that iOS updates can throttle CPU performance on iPhones with degraded batteries to prevent unexpected shutdowns. This is distinct from general slowness. Replacing the battery often restores performance on older iPhones running a recent iOS version.

How do I know if my phone is just too old for the new update?

Check the manufacturer's official supported device list for the OS version you installed. If your model is at the bottom of the list or was added reluctantly, the update was likely tuned for newer hardware and your device will run slower as a result.

Will downgrading to the previous software version fix the slowness?

Possibly, but both Apple and Google close the signing window for older versions quickly, usually within a few weeks, making a downgrade impossible for most users. Your practical options are to wait for a patch or work through the fix sequence in this article.

Can a software update cause permanent hardware damage that explains slowness?

No. Software updates do not physically damage hardware. However, they can expose pre-existing hardware problems, such as a failing battery or degraded storage, by placing higher demands on those components than the previous OS did.

Why Is My Phone Slower After a Software Update?

TL;DR: A phone slowing down after an update is usually temporary, caused by background indexing or recompilation finishing up. If slowness persists beyond 24-48 hours, the update likely exposed a hardware limitation, a bloated cache, or a runaway background process. Work through the sequence below before assuming the phone is finished.

What You Need

Your phone charged to at least 50%
About 20-30 minutes spread across a day or two
Access to your phone's Settings app
A backup of your data before any reset steps (see step 6)

1. Wait 24-48 Hours First

After a major OS update, the phone rebuilds app caches, reindexes your photo library, and recompiles app code to match the new runtime. This work runs in the background and hammers CPU and storage I/O.

Leave the phone on Wi-Fi and charging overnight. Most of the background work finishes within one to two days. If performance returns to normal, you are done.

Mistake to avoid: Rebooting repeatedly during this window restarts some of the indexing jobs and makes the wait longer.

Post-update slowdowns are usually temporary background processes finishing up.

2. Check Which Apps Are Consuming Resources

On Android: Settings > Battery > Battery Usage. Look for apps consuming battery with the screen off, which signals background activity.

On iPhone: Settings > Battery. Scroll down to see per-app activity broken down by on-screen and background time.

If one app is spiking, force-close it and check whether the phone responds better. A recently updated app may have a bug independent of the OS update.

3. Clear the System Cache (Android) or Offload Unused Apps (iPhone)

Android: Note that the system-wide "Cached Data" wipe option under Settings > Storage was removed in Android 8 (Oreo). On modern Android devices, you need to clear cache on a per-app basis: go to Settings > Apps > [App Name] > Storage > Clear Cache. Do this for any apps that appear to be misbehaving. Some manufacturers also offer a cache partition wipe via recovery mode , check your device's specific steps. Clearing cached data does not erase personal files.

iPhone: iOS does not expose a cache-clear button, but you can offload apps you rarely use: Settings > General > iPhone Storage, then tap an app and choose Offload App. This frees space without deleting your data.

Low storage is a common post-update slowdown trigger. iOS and Android both need free headroom, typically 10-15% of total storage, to operate efficiently.

4. Disable or Restrict Background App Refresh

Updates sometimes reset background refresh permissions.

iPhone: Settings > General > Background App Refresh. Turn it off globally or selectively for apps that do not need live updates.

Android: Settings > Apps, select an app, then Battery > Restrict or Background usage. The exact path varies by Android version and skin.

This step alone can noticeably improve responsiveness if several apps reset to aggressive background behavior after the update.

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5. Check for a Follow-Up Patch

Major OS releases frequently ship a point update within days or weeks that addresses performance regressions. Check:

iPhone: Settings > General > Software Update
Android: Settings > System > Software Update (or similar, varies by brand)

If a patch is available, install it. Point releases often carry specific performance and stability fixes that the headline release missed.

6. Back Up, Then Consider a Reset

If slowness persists after completing steps 1-5, the update may have left corrupted preference files or a fragmented system state that a clean install resolves.

Back up first. iPhone: iCloud backup or Finder/iTunes on a Mac. Android: Google backup plus a manual export of photos and contacts.

Then perform a factory reset and restore from backup. This resolves most persistent software-related slowdowns.

If performance is still poor after a clean reset, the update exposed an underlying hardware limitation. Newer OS versions drop optimization support for older chips over time. At that point, the phone may genuinely be reaching end of useful life.

7. Identify Whether the Hardware Is the Real Bottleneck

Some updates are deliberately heavier because they add features that older hardware was not designed to run well. This is sometimes called software-induced obsolescence, and it is a real phenomenon, not just a conspiracy theory. Apple and Google both publish supported device lists for major releases.

A decision table for what to do next:

Situation	Recommended Action
Slow for <48 hours after update	Wait, charge overnight
One app consuming excessive resources	Force-close, update or uninstall that app
Low storage after update	Offload apps, clear cache
Slow after clean reset on newer phone	Check for OS patch
Slow after clean reset on 4+ year old phone	Evaluate upgrade or professional diagnostic

Common Mistakes

Factory resetting immediately. Most cases resolve with steps 1-4. A reset is step 6, not step 1.
Installing every app from backup without checking. Restoring a problem app defeats the purpose of the reset.
Ignoring storage. Updates consume space. A phone that was already near-full before the update will slow down significantly.
Assuming the phone is broken. Persistent slowness after an update is usually a software state problem, not a hardware failure, until proven otherwise.

Bottom Line

Post-update slowness is usually temporary background work, a cache issue, or a rogue app, and it is almost always fixable without professional help. Work through the sequence above before drawing conclusions. If the phone remains slow after a clean reset and no OS patch is available, you are likely hitting a hardware ceiling and it is worth getting a professional opinion on whether repair, optimization, or replacement makes more sense.

For phone issues that go beyond software, including screen damage, battery problems, or water damage that may have been made visible by an update stressing the hardware, the team at Fix My PC Store handles mobile device repair from our West Palm Beach location. You can also start with remote support if you want a quick second opinion before bringing the device in.

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Bring it in. Most phone and tablet repairs are same-day, with parts that actually last.

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