What to do to keep Android from slowing down: a complete optimization guide

Even powerful smartphones Android over time begin to freeze, open applications slowly, or “stutter” when scrolling through the menu. The reasons for the brakes lie not only in weak hardware: an overloaded cache, background processes or unsuccessful updates are often to blame. In this article - 12 proven methods restore the device's performance, from basic to advanced, taking into account the features of modern versions Android 14/15.

We will not advise “buy a new phone” - instead, we will look at how disable hidden power-intensive functions that Google and manufacturers enable by default, but it is rarely mentioned in official instructions. All methods have been tested on devices from Samsung Galaxy S23 to budget Redmi Note 12, as well as on “pure” Android (Pixel, Motorola). If your smartphone is older than 2019, pay special attention to the sections about system cleaning and alternative firmware.

1. Diagnostics: why is Android slow?

Before optimizing, you need to understand the root of the problem. There are three types of brakes:

• 🔄 System lags —slow menu opening, freezing when swiping (processes are to blame system_server or android.ui).
• 📱 Applications slow down —specific apps take a long time to load or crash (the problem is their cache or a conflict with OS).
• 🔋 Slowdowns on low battery —Android artificially limits performance below 15-20% of the battery.

To identify the bottleneck, follow these steps:

1. Open Settings → Battery → Battery usage. See which applications are consuming >5% battery in the background.
2. Run Settings → Memory (or Storage). If <10% of the space is free, this is critical for speed.
3. Install CPU Monitor (from Play Market) and check the processor load at idle Normal. - < 15%.

If in CPU Monitor you see a constant load of >30% without active tasks, it is probably a virus or a “broken” system process. In this case, only resetting to factory settings. or flashing will help.

⚠️ Attention: On some devices (for example Xiaomi with MIUI), the built-in battery monitor hides the real energy consumption. For accurate diagnostics, use AccuBattery (requires root access on some firmware).

2. and garbage: quick methods

Application cache and system garbage are the main cause of slowdowns on devices older than 2 years. Cleaning gives a speed increase of up to 30% without data loss.

Method 1: Manually clearing the cache

Go to Settings → Applications → All applications. “heavy” (for example Facebook, Instagram, Google Play Services) and press Storage → Clear cache. Repeat for all applications occupying >100 MB.

Method 2: Automatic cleaning

Use the built-in tools:

• 🧹 On Samsung: Settings → Device maintenance → Cleaning.
• 🧹 On Xiaomi/Redmi: Security → Cleaning → Deep cleaning.
• 🧹 Clean Android: Settings → Storage → Free up space.

For deep cleaning of system junk (remnants of updates, temporary files) install SD Maid (requires root access) or Files by Google (works without superuser rights).

Method 3: Clear Dalvik cache (for advanced)

If, after updating Android, the smartphone begins to slow down, the damaged one is to blame Dalvik cache —temporary files of the Java virtual machine. To reset it:

1. Turn off the phone.
2. Hold Volume up + Power to enter Recovery Mode.
3. Select Wipe cache partition (volume button control).
4. Reboot.

⚠️ Attention: Do not confuse Wipe cache partition with Wipe data/factory reset! The second option will erase all your data.

3. Memory

Lack of RAM is the second most common reason for slowdowns. Android aggressively closes background processes, but some applications (especially Chinese) ignore these restrictions.

Method 1: Limiting background processes

Enable developer mode (Settings → About phone → Build number —press 7 times) and set the limit:

1. Go to Settings → System → Developer options.
2. Find Process limit and select Maximum 3 processes.

This will force close unnecessary background tasks, but may lead to more frequent application restarts (for example, messengers will take longer load).

Method 2: Disabling animation

Transition animations eat up to 10% of processor resources. To remove them:

1. In Parameters developer find:
2. Window animation scale → Without animation.
3. Transition animation scale → Without animation.
4. Animation duration → Off.

Method 3: Force GPU usage

To speed up the interface, enable GPU rendering:

1. B Developer options activate:
2. Force GPU use.
3. GPU debugging (profiling) → Overlaying screen updates (shows FPS).

After this, the interface will become smoother, but the battery will drain 5-10% faster.

4. Battery settings: why saving slows down the phone

Energy saving modes and “aggressive” battery optimization often cause lags. Manufacturers (especially Huawei, Xiaomi, Oppo) limit the background activity of applications by default, which leads to:

• 🐢 Slow updating of notifications (messengers, mail).
• 🔄 Freezes when switching between applications.
• ⚡ A sharp drop in FPS in games after 10 minutes of play.

How to disable unnecessary restrictions

Each brand has its own path:

Additionally disable for games Limiting performance when heated (located in the battery or game mode settings).

5. Firmware update and rollback

Sometimes brakes appear after updating Android. Manufacturers do not always optimize new versions for older devices. For example, Samsung Galaxy S10 after updating to Android 13 (One UI 5) began to freeze due to changes in memory management.

How to check if the update is to blame

If lags appeared immediately after the update:

1. Check reviews about the firmware on the forums (for example, 4PDA or XDA Developers).
2. Run Settings → System → Software update and look at the build version. If it ends with .Axx , this is a test version, which is better to roll back.

How to roll back to the old firmware

For this you will need:

• 🔗 Official firmware from the manufacturer's website (for example, Samsung Firmware or Xiaomi Flash Tool).
• 🖥️ app for firmware: Odin (for Samsung), Fastboot (for Pixel/Motorola), SP Flash Tool (for Mediatek).
• 🔋 Battery charge >50%.

Instructions for Samsung:

1. Download the firmware for your model (for example, G973FXXU4DUB3 for Galaxy S10).
2. Unpack the archive and run Odin.
3 Connect the phone in mode. Download Mode (Volume down + Power → confirm Volume Up).
4. In Odin, select the files:
- BL → file with BL in the name
- AP → file with AP
- CP → file with CP
- CSC → file HOME_CSC (saves data) or CSC (full reset)
5. Click Start and wait for the reboot.

⚠️ Attention: Firmware rollback will reset all data if you use the file CSC instead of HOME_CSC. It may also be blocked Knox (on Samsung), which will void your warranty.

6. Alternative firmware: when nothing helps

If the smartphone is older than 3 years, and the manufacturer stopped releasing updates, custom firmware can give it back a second life. For example, LineageOS or Pixel Experience work faster than standard shells due to the absence of “bloat” (pre-installed applications).

Pros and cons of custom firmware

How to install custom firmware

Step-by-step guide (for example LineageOS):

1. Unlock the bootloader:
   • For Xiaomi: apply on official website.
   • For Samsung: use fastboot oem unlock (requires OEM Unlock enabled in developer options).

1. Wipe → Advanced Wipe → Dalvik, Cache, System, Data.
2. Install → select ZIP with firmware.
3. Install → select ZIP with GApps.
4. Reboot System.

After installation, do not forget to update the firmware through Settings → System → Updates.

7. brakes

If software methods do not help, the problem may be in the hardware:

• 🔋 Worn out battery (capacity < 70%) → the phone is forced to slow down so as not to overheat.
• 💾 Damaged flash memory → slow data writing/reading (checked through AndroBench).
• 🔥 CPU overheating → throttling (automatic frequency reduction).

How to check hardware

Install CPU Throttling Test from Play Market:

• If the test shows a drop in processor frequency of >30%, overheating or battery wear is to blame.
• If the memory read speed is < 100 MB/s, the flash memory has degraded (needs replacement).

To check the battery, use AccuBattery:

• Capacity < 80% → time to change the battery.
• Charging current < 1000 mA → the power controller is faulty.

⚠️ Attention: On some smartphones (for example, Huawei P30 Pro) after replacing the battery, you need to reset the cycle counter through Huawei eRecovery, otherwise the phone will show the incorrect charge percentage.

8. Radical measures: reset and replacement

If nothing helps, there are two left. option:

1. Hard reset (Hard Reset) - returns the phone to factory settings, deleting all data.
2. Device replacement - if the smartphone is older than 4-5 years, its components are physically worn out.

How to do a Hard Reset correctly

Methods depend on the state of the phone:

• 📱 Through the menu: Settings → System → Reset settings → Delete all data.
• 🔧 Via Recovery:
  1. Turn off the phone.
  2. Hold Volume up + Power.
  3. Select Wipe data/factory reset.

fastboot erase userdata
fastboot erase cache
fastboot reboot

After the reset:

• Do not restore data from a backup - this will bring back the old problems.
• Install only the necessary applications.
• Disable automatic application updates in Play Market.
💡

Hard Reset helps in 80% of cases of system brakes, but does not solve problems with hardware (worn out battery, damaged memory).

FAQ: Frequently asked questions

Is it possible to speed up Android without root access?

Yes, most of the methods from this article (clearing the cache, disabling animations, battery optimization) work without root. root access is only needed for deep cleaning of system files or installing custom firmware.

Why did the phone slow down after updating Android?

Manufacturers often optimize new versions of the OS for flagships, but on budget or older models they work slower:

• New background services (eg. Google Play System Update).
• Changes in memory management (for example, Samsung One UI 5 limited background activity).
• Bugs in drivers (especially on Mediatek-processors).

Solution: roll back the firmware or install a custom one (for example, LineageOS).

How to check which application is slowing down Android?
Use the built-in monitor:
1. Settings → Developer → Processes (or Memory Usage).
2. See which applications are taking up >200 MB of RAM in the background.
3. Sort by Uptime CPU —those that consume >5% when idle are to blame.

For a detailed analysis, install Simple System Monitor (shows CPU, RAM and network load in real time).