How to speed up an old Android phone: storage, apps, animations and resets

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An Android phone that felt quick when new often feels sluggish after two or three years: apps take longer to open, the keyboard lags and the camera hesitates. Some of that is newer apps asking more of older hardware, but much of it can be fixed. Work through these steps in order, from the easiest to the most drastic. Menu names differ between manufacturers, so use the search bar at the top of Settings if you cannot find an option.

1. Free up storage

A nearly full phone slows down noticeably, because the system needs free space to work with.

Open Settings, then Storage to see what is taking up space.
Clear out downloads, old screen recordings and videos sent through messaging apps, which pile up silently.
Back up photos and videos to a cloud service or computer, then remove the local copies you do not need. Make sure the backup has finished first.
Large apps you rarely use are often the biggest win; see the next step.

Aim to keep a comfortable margin of free space rather than running the phone to its last few gigabytes.

2. Uninstall or disable apps you do not use

Go through your app list and uninstall anything you have not opened in months.
Pre-installed apps that cannot be uninstalled can often be disabled from their App info page. Disabled apps stop running and disappear from the app drawer.
Watch for apps that run in the background constantly: duplicate cleaners, boosters, multiple social apps and widgets that refresh all day.
Avoid "cleaner" and "booster" apps. Android manages memory itself, and these apps often run in the background, show ads and slow the phone further.

3. Trim the home screen

Live widgets, animated wallpapers and third-party launchers all use resources. Switch to a static wallpaper and remove widgets you do not look at. If you use a third-party launcher, try the phone's own for a day to compare.

4. Update, but check first

Install pending system updates from Settings, along with app updates from the Play Store. Updates often fix bugs and performance problems.
On a very old phone, a major Android version upgrade can occasionally feel slower than the version before. Read reports from other owners of your exact model before installing a big upgrade.
Once a phone no longer receives security updates, it becomes riskier to use for banking and email, whatever its speed.

5. Shorten the animations

This makes the phone feel quicker even though nothing actually runs faster.

Go to Settings, then About phone, and tap Build number seven times to unlock Developer options. On some phones it sits inside a Software information page.
Open Developer options (often under System).
Set Window animation scale, Transition animation scale and Animator duration scale to 0.5x.

Leave the other developer settings alone unless you know what they do.

6. Check battery health

A worn battery can make a phone throttle, restart unexpectedly or die at 30%. Many recent phones show a battery health figure in their battery settings, and some manufacturers offer it through their own diagnostics or support app. If the battery is clearly worn, replacing it through an authorised repair service can make an old phone feel far more usable.

7. Clear an app's cache when one app misbehaves

If a single app is slow or glitchy, open its App info page, then Storage, and choose Clear cache. This is safe. Clear storage (or clear data) resets the app completely and can delete things saved only on the phone, so use it carefully.

8. Restart regularly

A restart clears temporary problems. Many phones offer a scheduled restart option in their settings; once a week is plenty.

9. When to factory reset

If the phone is still slow after all of the above, a factory reset removes years of leftover files and settings.

Back up first: photos, messages, two-factor authentication apps and chat histories. Check that each app you depend on can restore its data.
Make sure you know your Google account password, because the phone will ask for it afterwards.
After the reset, install only the apps you actually use, rather than restoring everything at once.

If a reset does not help, the hardware itself may simply be behind what today's apps expect, and it may be time to replace the phone. Which step made the biggest difference on your phone? Share your model and results in the comments.