Why Is My Phone So Slow? How to Speed Up a Laggy iPhone or Android

Your phone used to feel instant, and now it doesn't. Apps hang on a blank screen before they open, the keyboard falls a beat behind your thumbs, scrolling stutters, and switching apps feels like wading through mud. It's one of the most common complaints we hear, and the good news is that a phone that's a few years old is very rarely actually worn out — most of the time it's something you can fix in a few minutes, for free.

The trap to avoid first: the app stores are full of "phone booster," "cleaner," "speed-up," and "RAM optimizer" apps that promise to make a slow phone fast. Skip them. Modern iPhones and Androids manage their own memory, so these apps do nothing useful — and many are ad-stuffed or, on Android, are themselves the thing slowing you down (or worse). Every genuinely effective fix below uses settings already built into your phone.

The reason a phone slows down almost always comes down to one of a handful of things: it's nearly out of storage, the battery has aged, too much is running in the background, it's throttling because it's hot, or a recent update is still settling in. This guide walks through them in the order most likely to help, and it covers both iPhone and Android — the causes are the same even though the menus differ.

Did you just update? Give it 48 hours first

If your phone got noticeably slower right after a system update — this is a big one after major iOS releases like iOS 26, and after Android version jumps — don't panic and don't start changing things yet. After a big update, your phone spends a day or two re-indexing photos, files, and search behind the scenes, and every app effectively gets re-optimized the first time you open it. During that window it can feel sluggish, run warm, and drain faster than usual, even on a brand-new phone.

This almost always clears up on its own within 24 to 72 hours of normal use, especially if you leave the phone charging overnight so it can finish that background work. Restart it once (see the next step), then give it a couple of days before you judge it. If it's still slow after that, or if it's slow and you haven't updated recently, work through the rest of this guide.

Restart it properly — the step everyone skips

Phones get left on for weeks or months at a time, and locking the screen is not the same as restarting. Over time, memory fills with half-closed apps and background processes that never fully let go, and the phone gets progressively more sluggish until it's given a clean start. A proper restart clears all of that in about thirty seconds and is the single most effective quick fix — before you do anything else, actually power it fully off and back on.

On an iPhone, hold the side button and a volume button until "slide to power off" appears (or say "Hey Siri, restart"); on Android, hold the power button, or power and volume-up, and choose Restart. Make this a habit — restarting once a week keeps most phones feeling noticeably snappier and heads off a lot of "it's randomly slow today" complaints.

Free up storage — the number-one real cause

This is the most common genuine cause of a slow phone, and the one people most often overlook. When a phone gets close to full, it has no room to shuffle temporary files around, and everything — opening apps, taking photos, updating, even typing — slows to a crawl. As a rule of thumb, try to keep at least 10% of your storage free; if you're down to the last gigabyte or two, freeing space alone can bring the speed right back.

On an iPhone, go to Settings > General > iPhone Storage. That screen shows what's eating your space and offers one-tap suggestions — turn on "Offload Unused Apps" (it removes apps you don't use but keeps their data, so you can reinstall later without losing anything), review large photos and videos, and clear Safari's cache under Settings > Apps > Safari > Clear History and Website Data. On Android, open Settings > Storage (or use the free Google "Files" app and tap Clean), which will point you at junk files, big media, and unused apps you can remove.

One Android-specific tip: if a single app is misbehaving — the phone is fine except one app that's slow or glitchy — clear that app's cache under Settings > Apps > (the app) > Storage & cache > Clear cache. That dumps its temporary files without touching your logins or data. (There's no longer a single button to clear all caches at once on modern Android, and you don't need one — do it per app only when an app is acting up.) If you keep running out of space no matter what you delete, our storage guides below go deep on exactly what's safe to remove.

Cut down what runs in the background

The more apps that are allowed to wake up, refresh, and fetch data in the background, the less the phone has left for whatever you're actually doing. You don't need to obsessively swipe apps closed — modern phones freeze background apps well on their own, and force-closing an app you'll reopen in a minute actually wastes power. The bigger win is trimming what has permission to run when you're not looking.

On an iPhone, go to Settings > General > Background App Refresh and turn it off for apps that don't need live updates (or switch it to Wi-Fi only). On Android, the system limits background activity automatically, but the real fix is uninstalling apps you don't use — every installed app can add background services, notifications, and startup weight even when you never open it. Be honest about which apps you actually need, and remove the rest; a phone with 40 apps almost always feels faster than the same phone with 150.

Turn down the animations — an instant "faster" feeling

A lot of what reads as "slow" is actually the phone's own animations — the little zoom when an app opens, the slide between screens. Speeding those up or switching them off makes the phone feel dramatically snappier even though nothing about the hardware changed, and on older phones it genuinely reduces the wait.

On an iPhone, turn on "Reduce Motion" under Settings > Accessibility > Motion, and "Reduce Transparency" under Settings > Accessibility > Display & Text Size — together they cut a lot of visual overhead. On Android, the animations live in the hidden Developer options: go to Settings > About phone and tap "Build number" seven times to unlock them, then in Settings > System > Developer options set "Window animation scale," "Transition animation scale," and "Animator duration scale" all to 0.5x (or Off). Change all three to match, and your phone will feel noticeably quicker the moment you leave the menu.

The one people miss: a tired battery

Here's the cause that surprises people most. As a phone battery ages, it can no longer deliver bursts of power cleanly, so the phone deliberately slows its processor down to avoid shutting off unexpectedly under load. The result feels exactly like a "slow phone" — but the real problem is the battery, and a slow phone that also dies quickly or shuts off at 20-30% is almost certainly telling you this.

On an iPhone you can check directly: Settings > Battery > Battery Health & Charging. If Maximum Capacity is well below 100% (many people find it in the 70s or low 80s after a couple of years), and especially if you see a note under "Peak Performance Capability" saying performance management has been applied after an unexpected shutdown, the battery is the bottleneck. Android doesn't always expose a health figure, but the same physics apply — an old phone that's slow and drains fast is a battery story. The fix is a battery replacement, which is far cheaper than a new phone and often makes a two- or three-year-old device feel new again. Our battery guide below helps you confirm it before you spend anything.

Still slow? A few less-obvious culprits

If everything above checks out and it's still sluggish, look at a few specifics. A phone that's slow and hot to the touch is throttling because of heat, not age — get it out of the sun and out of its case, and see our overheating guide. If just one app is the problem, uninstall and reinstall it fresh. And make sure the phone's software is actually up to date (Settings > General > Software Update on iPhone; Settings > System > Software update on Android) — updates often include performance and security fixes, and skipping them leaves known slowdowns unpatched.

On Android specifically, if the phone suddenly got slow, is showing pop-up ads, or has apps you don't remember installing, you may have picked up adware or a bad app — usually from installing something outside the Google Play Store. Boot into Safe Mode (hold the power button, then press and hold "Power off" until the Safe Mode prompt appears) to see if the slowdown stops with third-party apps disabled, and uninstall anything suspicious. iPhones are far more locked down and this is rare there. If nothing else works and the phone has years of accumulated clutter, a factory reset returns it to like-new speed — but back everything up first, because it erases the phone completely, and only reinstall the apps you truly use.

How we can help

Most slow phones come back to life with the free steps above — clear some space, restart it, trim the background, and, on an aging phone, replace the battery. We'd always rather tell you that than sell you anything, and we'll never point you at a "booster" app, because they don't work and some make things worse.

If you're not sure whether it's a tired battery, a storage problem, or a phone that's genuinely reached the end of the road, that's exactly the kind of thing we sort out for people across Southern California and the Coachella Valley — an honest look, a battery swap if that's the fix, or a straight answer about whether it's worth repairing versus replacing. Bring it in and we'll figure out which it is before you spend money on a new one.