Update made your phone slow? Don't panic — fix it in this order
It's September, which means big OS updates are rolling out — and right on schedule, the forums are filling up with the same post: "My phone was fine yesterday. Now it's a brick with a screen." Take a breath. Post-update slowdowns are almost always temporary, and the fixes are free. You just have to do them in the right order.
First: do nothing for a day
Weird advice, but it's the most important step. Right after a major update, your phone is secretly busy — re-indexing everything for search, re-scanning your photo library, rebuilding caches, retraining its on-device AI. All of that burns CPU, which is why the phone feels heavy and runs warm and eats battery.
So plug it in overnight and give it 24 to 48 hours before you judge anything. Then restart it. Yes, actually restart it — that ten-second move clears more problems than everything else on this list combined.
Then: update your apps. All of them
Here's what most people miss: developers push compatibility fixes in the days right after an OS release, because their apps were built for the old version. One stale app can quietly chew through CPU and memory on the new OS. Open the App Store or Play Store and update everything — including the apps you never open. Especially those, actually.
Check your storage while you're at it
Updates eat space, and a nearly-full phone is a slow phone. You want 10-15% free, minimum. Offload the games you finished in 2024, clear the downloads folder, let old videos move to the cloud.
Now the deeper cleans
Android folks: wipe the cache partition. Power off, hold Power + Volume Down, and pick "Wipe Cache Partition" from recovery. Your data's untouched; stale system junk is gone. Bonus trick — turn on Developer Options and drop the window animation scale to 0.5x or off. The phone isn't faster, but it feels faster, and honestly, that's half the battle.
iPhone folks: your version is Reset All Settings (Settings > General > Transfer or Reset iPhone > Reset). Keeps your data, resets the network and system preferences that occasionally come through an update corrupted. And flip on Reduce Motion under Accessibility > Motion to cut animation overhead.
Still slow? Hunt the guilty app
At this point, one bad app is the likely suspect. Android has a great tool for this: Safe Mode (long-press the Power Off option, confirm). It boots with third-party apps disabled — if your phone suddenly feels fine, an app's the problem. Uninstall the recent ones one by one until the lag dies with one of them. On iPhone, open Battery settings and look for anything with suspicious background activity.
One more thing worth saying: sluggishness plus heat plus battery drain can occasionally mean malware, not update pains. If you've installed anything from outside the official stores lately, start your suspicions there.
Last resorts, in order
Install every point update that appears — companies ship performance patches within weeks of a major release, built from complaints exactly like yours. And if nothing on this list worked, the factory reset remains undefeated. It costs you an evening of setup and fixes what nothing else can.
Old hardware running new software does slow down eventually — that part's real. But it's rarely the whole story, and it's never the first suspect. Work the list before you work the checkout page.
Image: Szabó Viktor, via Pexels
