Not all apps are created equal. Some are lightweight and well-optimized. Others run constant background processes, drain your battery, consume memory, and make everything else on your phone feel slower — even when you’re not actively using them.
The good news is that identifying and removing these apps is straightforward, and the performance improvement is often immediate. This guide shows you how to find the culprits and deal with them effectively on both Android and iPhone.
How Apps Slow Down Your Phone
An app can affect your phone’s performance in several ways even when you’re not using it:
Background processes — Many apps continue running after you close them, syncing data, checking for updates, or tracking your location in the background.
Memory consumption — Apps that stay resident in memory compete with everything else on your phone for the available RAM. On phones with limited memory, this creates bottlenecks.
Storage bloat — Apps accumulate data over time — cached content, downloaded files, logs — that expands well beyond the original install size.
Notification activity — Apps that send frequent notifications wake your screen and processor repeatedly throughout the day.
Auto-start behavior — Some apps are configured to launch automatically when your phone restarts, adding to the startup load and staying active indefinitely.
Understanding which of these is affecting your phone helps you decide whether to remove an app, restrict it, or just clear its data.
Step 1: Identify Which Apps Are Using the Most Resources
Before removing anything, find out what’s actually causing the problem.
On Android:
- Battery usage: Settings → Battery → Battery Usage. This shows which apps have consumed the most battery since your last charge. An app using significant battery in the background when you rarely open it is a red flag.
- Storage usage: Settings → Apps → sort by size. This shows which apps (including their accumulated data) are taking up the most space.
- RAM usage: Settings → Device Care → Memory (on Samsung) or similar. Shows which apps are currently using memory.
On iPhone:
- Battery usage: Settings → Battery → Battery Usage by App. Shows battery consumption over the last 24 hours or 10 days, broken down by on-screen and background activity. An app with high background activity that you rarely use is worth examining.
- Storage usage: Settings → General → iPhone Storage. Lists all apps sorted by size, including the size of their stored data separately from the app itself.
Spend five minutes with these screens before deciding what to remove. The results are often surprising — apps you forgot you installed are sometimes the biggest resource consumers.
Step 2: Uninstall Apps You Don’t Actually Use
The most effective fix is the simplest one. If an app is causing problems and you don’t genuinely need it, remove it.
On Android:
- Long-press the app icon → tap Uninstall
- Or go to Settings → Apps → select the app → Uninstall
On iPhone:
- Long-press the app icon → tap Remove App → Delete App
- Or go to Settings → General → iPhone Storage → select the app → Delete App
Work through your app list and be honest about what you actually use. A reasonable rule: if you haven’t opened it in 30 days and it doesn’t serve a specific purpose you’ll need soon, uninstall it.
Step 3: Replace Heavy Apps with Lighter Alternatives
Some apps are genuinely useful but unnecessarily resource-heavy. In these cases, switching to a lighter alternative gives you the functionality without the performance cost.
Facebook is one of the most resource-intensive apps on any platform. The mobile website (facebook.com in your browser) provides most of the same functionality and uses a fraction of the memory and battery. On Android, you can add it to your home screen as a shortcut so it feels like an app.
Instagram has a similar story. The web version at instagram.com works well for browsing and posting, without the background tracking and memory usage of the app.
Snapchat is known for high battery and memory usage. If you use it casually rather than constantly, keeping the web version bookmarked and only opening it when needed reduces its impact significantly.
TikTok runs extensive background processes. If you use it, restrict its background activity rather than letting it run freely: Settings → Apps → TikTok → Battery → Restricted (Android).
Step 4: Restrict Background Activity for Apps You Keep
For apps you want to keep but don’t need running constantly in the background, Android gives you precise control.
Go to Settings → Apps → select the app → Battery. You’ll see options including:
- Unrestricted — the app can run in the background freely
- Optimized — the system manages background activity intelligently (default for most apps)
- Restricted — the app cannot run in the background at all
Set apps you open occasionally — games, shopping apps, less-used social media — to Restricted. They’ll still work normally when you open them, but they won’t consume resources when you’re not using them.
On iPhone, go to Settings → General → Background App Refresh and turn it off for apps that don’t need real-time updates.
Step 5: Deal with System Apps and Bloatware
Many Android phones — particularly from manufacturers like Samsung, Xiaomi, and others — come with pre-installed apps that can’t be uninstalled. These are often called bloatware.
While you can’t remove them in the traditional sense, you can disable them:
- Go to Settings → Apps
- Find the pre-installed app you want to disable
- Tap Disable
A disabled app doesn’t run, doesn’t appear in your app drawer, and doesn’t consume resources. It’s still technically on the device but effectively inactive. This works for manufacturer apps, carrier apps, and other pre-installed software you never use.
Step 6: Clear Data for Apps You’re Keeping
If an app has been installed for a long time, its accumulated data can cause it to run slower than it should — and consume more storage than necessary.
Clearing an app’s data resets it to a fresh state, as if it were just installed. Note that this removes any locally stored settings or preferences for that app, so you may need to log back in.
On Android: Settings → Apps → select the app → Storage → Clear Data
Do this for apps that feel sluggish or crash frequently. Combined with clearing the cache, it often resolves app-specific performance issues without uninstalling.
The Apps Most Likely to Slow Down Your Phone
Based on common reports and resource monitoring, these categories of apps tend to have the highest impact on phone performance:
Social media apps — Facebook, Instagram, TikTok, Snapchat. High memory usage, constant background syncing, aggressive notification activity.
News and content apps — Apps that constantly refresh feeds in the background consume battery and data even when you haven’t opened them.
Antivirus apps (third-party) — Ironically, some third-party security apps run constant background scans that consume more resources than the threats they protect against. The built-in security on Android (Google Play Protect) and iPhone is sufficient for most users.
Old games — Games accumulate large amounts of cached data and often run background services. If you’ve finished a game or stopped playing, uninstalling it recovers both storage and processing resources.
Duplicate apps — Having two apps that do the same thing (two browsers, two music players, two file managers) splits resources unnecessarily. Pick one and remove the other.
Frequently Asked Questions
Will removing apps delete my data from those services? No. Uninstalling an app from your phone removes the local app and its cached data, but your account and data on the service’s servers remain intact. When you reinstall and log back in, everything is still there.
How do I know if an app is safe to disable? For pre-installed system apps, be cautious — some are required for the phone to function properly. Stick to disabling apps with recognizable names that are clearly non-essential (a carrier’s TV app, a manufacturer’s theme store, etc.). If you’re unsure, search the app name to find out what it does before disabling it.
My phone slowed down after installing a specific app — how do I confirm it’s the cause? Uninstall the app and use your phone normally for a day. If performance improves, that app was likely the cause. You can also check battery and memory usage before and after to compare.
Does restarting my phone help with app-related slowdowns? Yes, temporarily. Restarting clears RAM and stops background processes, which gives immediate relief. But if the same apps restart automatically, the slowdown returns. The permanent fix is restricting or removing the problematic apps.
Are there apps that help identify what’s slowing my phone down? On Android, CPU-Z and Device Info HW show real-time resource usage. However, the built-in battery and storage screens in Settings are usually sufficient for identifying the main offenders without installing additional software.
Final Thoughts
A slower phone is often just a phone with too many apps competing for limited resources. Identifying the heaviest offenders, removing what you don’t need, and restricting background activity for the rest can transform day-to-day performance without spending anything.
Start with the battery usage screen — it takes thirty seconds to open and tells you immediately which apps are working hardest when they shouldn’t be.
For a complete performance overhaul that goes beyond app management, see our guide on How to Improve Performance on an Old Smartphone — it covers everything from storage cleanup to animation settings and battery health.