My Pixel 8 was crawling. I’m talking about three-second delays just to open the camera app. Instagram would freeze mid-scroll. The keyboard had noticeable lag when I typed. And the thing is, I updated to Android 15 expecting improvements. That’s what Google promised, right?
For the first two weeks, I blamed myself. Maybe I had installed too many apps. Maybe it was just my imagination. But then I started digging through forums, tested a bunch of fixes, and slowly pieced together what was actually going on. Some things made zero difference. A few made a massive one.
Here’s everything I found: the stuff that genuinely helped and the stuff I wasted time on.
First, Understand Why Android 15 Might Feel Slow
Before you start tinkering, it helps to know what is actually slowing things down. Android 15 brought some significant under-the-hood changes: better predictive back gestures, new privacy controls, and smarter adaptive battery logic. All good stuff on paper. But these features come with background processes that your phone’s processor might not love, especially if your device is two or three years old.
Also, fresh updates tend to trigger a re-indexing phase. Your phone spends a few days reorganizing apps, rebuilding caches, and relearning your usage patterns. I noticed my Pixel was hottest and slowest for about three days after the update. If you just updated, give it 48–72 hours before panicking.
That said, if it’s been weeks and your phone still feels sluggish, keep reading.
According to the Official Android 15 Developer Documentation , the update introduced significant background process changes that directly affect performance on older hardware which explains why some devices feel slower right after updating.
Step 1: Kill the Animations (This Is the Fastest Win)
This is the first thing I do on every Android phone I set up, and I’m always surprised how many people have never heard of it.
Go to Settings → About Phone → Build Number. Tap “Build Number” seven times. Yes, seven. It’ll show a countdown and eventually say “You are now a developer.” Head back to the main Settings, and you’ll now see Developer Options near the bottom.
Inside Developer Options, scroll down until you find three settings:
- Window animation scale
- Transition animation scale
- Animator duration scale
All three are probably set to 1x. Change them all to 0.5x.
The difference is immediate. Your phone doesn’t actually get faster, but it feels dramatically faster because the system animations are cut in half. Opening apps, switching between them, pulling down the notification shade all of it snaps.
I did this on a friend’s Galaxy S23 FE that was stuttering on Android 15, and he thought I’d factory reset it.
Step 2: Figure Out Which App Is Eating Your RAM
Android 15’s memory management is smarter than previous versions, but it can still get overwhelmed if one or two apps are being greedy.
Go to Settings → Battery → Battery Usage (or on Samsung, Settings → Device Care → Battery). Sort by usage and look for anything unexpected in the top five. On my phone, I found that an old fitness app I barely used was somehow drawing battery and RAM in the background 24/7.
For a more granular look, use an app called AIDA64 (free on the Play Store). It gives you a real-time breakdown of RAM, CPU temperature, and background processes. Not glamorous, but it’s helped me catch rogue apps twice now.
Once you identify the culprit, force-stop it through Settings → Apps → [App Name] → Force Stop and check if the situation improves.
If your phone is also draining battery faster than usual alongside the lag, check out our detailed Android Battery Drain Fix: 6 Quick Fixes it covers battery-specific tips that pair perfectly with these speed fixes.
Step 3: Turn Off Features You’re Not Using
Android 15 has a bunch of features running quietly in the background. Some of them are genuinely useful. Some of them you’ve probably never intentionally activated.
Here’s what I turned off that made a noticeable difference:
Live Wallpaper / Animated Wallpapers These look great in demos, but they chew through resources constantly. Switch to a static wallpaper, even temporarily, to see if it helps.
Always-On Display (AOD) is lovely, but it runs continuously and keeps your display driver partially active. On older devices, this has a real performance cost.
Nearby Share & Wi-Fi Scanning Go to Settings → Location → Wi-Fi Scanning and disable it. Also check Settings → Connected Devices → Connection Preferences → Nearby Share. If you don’t use it constantly, turn it off.
Automatic Backup Sync Not a huge deal, but if it syncs while you’re actively using the phone, you’ll feel it. Schedule it for night or manual mode via Settings → Google → Backup.
Step 4: Clear the Cache Partition (Not Just App Cache)
People confuse these two things all the time. I did too, initially.
Clearing an app’s cache from Settings is helpful but limited. What you actually want is the system cache partition, which stores temporary files used during the OS update process. After upgrading to Android 15, this cache can become bloated or corrupted.
The method varies by device:
For Pixel phones: Hold Power + Volume Down to enter recovery mode. Select “Wipe cache partition.” Done.
For Samsung: Power off the device. Hold Power + Volume Up (sometimes the Bixby button too, depending on the model) to enter recovery. Navigate to Wipe Cache Partition.
For OnePlus, Xiaomi, and others: It’s a similar process, but the button combination varies; a quick Google search for your specific model will confirm.
This wiped out a mysterious lag issue I’d had for weeks on my Pixel. It’s not a magic bullet, but it’s worth the five minutes.
Step 5: Audit Your “Adaptive Battery” and Background App Settings
Android 15 has an improved Adaptive Battery feature that’s supposed to learn your habits and restrict background activity for apps you rarely open. In theory, great. In practice, I’ve seen it backfire; it sometimes restricts apps you do use, causing them to reload from scratch every single time you open them, which is actually slower.
Check this at Settings → Battery → Adaptive Preferences (or Battery Optimization on some skins). Look through your most-used apps and make sure they’re not set to “Restricted.” Set critical apps to “Unrestricted” or at least “Optimized.”
Also visit Settings → Apps → [App] → Battery for your most-used apps. I found my email client had been restricted, which explained why it took five seconds to load every time.
For a deeper dive into saving battery life alongside performance, our Android Battery Drain Fix guide walks you through Power Saving Mode, background app controls, and more all tested on real devices.
Step 6: Check Your Storage Situation
Android needs breathing room. The general rule of thumb is to keep at least 10–15% of your storage free. Below that, you’ll start seeing slowdowns as the OS struggles to create temporary files.
Go to Settings → Storage and see where you stand. If you’re above 85% full, that’s a red flag.
The quickest wins:
- Google Photos or Google One backup, then delete local copies of media
- Files by Google (free app) has a built-in junk cleaner that finds duplicate files, blurry photos, and old downloads
- Uninstall apps you haven’t opened in 60 days
I found 4GB of old WhatsApp media hiding in my Downloads folder. Deleted it in two minutes.
Step 7: Consider a Lite Version of Heavy Apps
This sounds obvious, but people skip it. Facebook, Instagram, and LinkedIn are notoriously heavy apps. They run background processes, sync constantly, and use aggressive caching.
Facebook Lite and Messenger Lite are legitimate apps on the Play Store, and they run dramatically better on mid-range devices. Instagram doesn’t have an official lite version, but using it through a browser (Chrome, add to home screen) saves significant RAM.
I switched to Facebook Lite on a recommendation from a comment thread, and it felt like I’d gotten a new phone. Half the lag, gone.
Step 8: Don’t Overlook a Soft Reset Routine
This sounds too simple, but when did you last restart your phone? Don’t sleep in it. Restart it.
Android 15 is designed to run for days without a restart, but memory leaks happen. Apps don’t always clean up after themselves properly. A weekly restart clears accumulated junk in RAM and resets background services.
I set a weekly alarm labeled “Restart Phone.” Takes 45 seconds. Makes a real difference.
Mistakes I Made Along the Way
Using third-party “RAM booster” apps. Absolute garbage. These apps forcefully kill background processes, which sounds helpful but actually increases the time it takes to open apps because Android then has to reload everything from scratch. Avoid them completely.
Doing a factory reset too early. I did this on an older phone before I’d done the other steps, and I lost hours of setup time only to find the same issues came back after I reinstalled my apps. A factory reset should be your last resort, not your first.
Disabling too many things in Developer Options. I went too deep down the rabbit hole once and disabled some GPU rendering options that actually made things worse. If you experiment there, keep notes on what you changed.
When Nothing Works
If you’ve done everything above and your phone is still painfully slow, it might be time to have an honest conversation with yourself about the hardware.
Android 15 is optimized for devices with at least 6GB of RAM. If you’re on a 4GB device from 2021 or earlier, you might genuinely be hitting a hardware ceiling. Android 15 isn’t perfectly backwards-compatible in terms of performance. Google doesn’t really advertise that part.
In that case, your options are a factory reset (fresh start, no clutter) or considering an upgrade. Mid-range phones in 2024–2025 are excellent; you don’t need to spend $1,000 to get a snappy experience anymore.
Final Thoughts
The biggest thing I learned through all of this is that speed issues on Android 15 are rarely caused by one single thing. It’s usually a combination of a background app here, a bloated cache there, and animations eating up perceived responsiveness. Tackle them one by one, and you’ll see cumulative improvements.
Start with the animation scales. That alone will change how your phone feels. Then move through the list at your own pace.
And honestly? Don’t let it stress you out. Android is endlessly tweakable, which is both its strength and its curse. You’ll find your sweet spot.
Found something else that worked for you? Different phone, different experience? I’m always curious; drop it in the comments.
