How to speed up Xiaomi Redmi 9: from cache cleaning to deep optimization

Xiaomi Redmi 9

Don’t rush to buy a new phone.

In this article, we will discuss 12 Proven ways to speed up Redmi 9 So we start with simple steps (cleaning the cache, turning off animations) and go to deep optimization (resetting the recovery partition cache, disabling). MIUI-All methods tested on firmware MIUI 12–14 and relevant to Redmi models 9/9A/9C/9T.

If your smartphone is slower after the update, freezes when you start apps or warms up for no reason - this is the guide for you. No root rights or special knowledge is required: just follow the step-by-step recommendations.

1.Diagnosis: Why is Redmi 9 slowing down?

Before optimizing your phone, it’s important to understand the source of the problem.The Redmi 9 can slow down for the following reasons:

• 📱 Lack of RAM – Redmi 9 has only 3-4 GB of RAM, which are quickly clogged with background activity of applications.
• 🗑️ Overflowing storage – if less than 10% of the memory is free, the system starts to “hang».
• 🔄 Older versions of the old version MIUI They contain bugs that slow down the work.
• 🤖 Background processes MIUI — Xiaomi services (e.g., mipush, analytics) consume resources.
• 🔥 Overheating - at a temperature higher 45°C Helio processor G35/G80 Automatically reduces productivity.

How do I check the system boot?

Go to Settings. → The phone. → Status of the system → If you see unknown processes with high consumption (com.xiaomi.*, android.process.media) in the list, you need to disable them.

Redmi 9 error: after updating to MIUI 13+ Many users are facing lags due to the unoptimized core for the Helio processor G35. The solution is a rollback MIUI 12.5 or manual optimization (see Section 6).

2.Cache and garbage cleanup: a quick way to free up memory

The easiest way to speed up Redmi 9 is to remove unnecessary temporary files. app cache, update residues and debris from MIUI It can take up to 5-10 GB of memory.

Step 1. Clean up the app cache

1. Open Settings → Applications → Application Management.
2. Slip on the three dots in the upper right corner → Sort by size.
3. Select apps with large cache (for example, YouTube, Facebook, Telegram) → Clear the cache.

Step 2: Systemic debris disposal

MIUI has a built-in tool:

1. Go to Settings → Memory → Cleanup.
2. Press Deep Clean and wait for analysis.
3. Delete unnecessary files (especially note App Remains and Files) APK).

Step 3: Clean up the recovery partition cache (advanced method)

If the phone is severely slowing down when booting, cache reset via Recovery Mode will help:

1. Turn off Redmi 9.
2. Press the Power button + Volume up until the MI logo appears.
3. Select Wipe & Reset → Wipe Cache (control – volume buttons, confirmation – power button).
4. Reboot your phone (Reboot → System)

⚠️ Note: Do not confuse Wipe Cache with Wipe Data! The second option will delete all your data (photos, contacts, applications).

3. Optimization of RAM (RAM)

Redmi 9 has only 3-4 GB of RAM, which is only enough for 3-4 background applications. If you do not control the use of memory, the system begins to “hang” when switching between tasks.

Method 1. Disabling background activity

• 🚫 Go to Settings. → Annexes → Application management.
• Select an app (such as Instagram) → Permits → Background activity → Limit.
• 🔄 For system applications (e.g. Google Play Services) use Settings → Battery and productivity → Battery management → Choice of applications → Limit background activity.

Method 2: Use of the Light mode» (MIUI Lite)

V MIUI 12+ There is a hidden function of the lightweight interface:

1. Activate Settings → Special Options → Lite Mode.
2. Reboot the phone.

⚠️ Note: Some visual effects are disabled in Lite mode MIUI (For example, smooth transitions, but the speed of work increases by 15-20%.

Method 3: Manually release RAM

If the phone freezes, quickly release the memory:

1. Press the recent apps button (square at the bottom of the screen).
2. Slip on the icon Close everything (cross or basket).
3. Use a command to clean it completely (required) ADB): adb shell am broadcast -a android.intent.action.CLOSE_SYSTEM_DIALOGS

💡

If RAM is still clogged quickly after closing applications, check your phone for viruses using Malwarebytes or Dr.Web Light. Some Trojans disguise themselves as system processes (for example, com.android.system).

4. Disable animation and visual effects

MIUI She's known for her beautiful but resource-intensive animations, and turning off unnecessary effects can speed up the interface by 20 to 30 times%.

Step 1: Disable animation through Developer Settings

1. Activate Developer Mode: Settings → About Phone → MIUI version (shap 7 times).
2. Back to Settings → Additionally. → For developers.
3. Find the settings: The scale of the window animation → No animations The scale of transition animation → Without animation Duration of animation → Shut down.

Step 2: Simplify the interface MIUI

• 🎨 Go to Settings. → Display. → Screen style → Choose Simple (remove shadows and gradients).
• 📱 Turn off the live wallpaper in Settings → Wallpaper. → Static.
• 🔍 B Settings → Search disable Application Offers and Recommendations.

Step 3: Turning off unnecessary gestures

Some gestures MIUI conflict with applications:

1. Settings → Additionally. → Gestures and movements.
2. Turn off: Raise Double Touch to wake up Swipe down for the notification panel (if you use navigation buttons)

💡

Disabling animations does not affect performance in games or benchmarks, but significantly speeds up everyday use (switching between apps, opening menus).

5.Storage optimization: What can be safely removed?

If Redmi 9 has less than 5GB of free space, the system starts to slow down. What can be removed without risk?

What NOT to delete:

• 🚫 folder MIUI The root of the storage (contains system files).
• 🚫.odex and.oat files in /system (responsible for the operation of applications).
• 🚫 Android folder → Data (stores application settings).

6. Update and roll back firmware: when does it help?

Redmi 9 has started to slow down after the update MIUI, There are two options:

1. Upgrade to the latest stable version (if the current firmware contains bugs).
2. Reverse to the previous version (if the lags appeared after the update).

How to update MIUI manually?

1. Download the firmware for your model from the official Xiaomi website (choose Stable, not Developer).
2. Rename the file to update.zip and move it to the root of the memory.
3. Go to Settings → About Phone → System Update → Three Dots → Select a firmware file.
4. Confirm the installation and wait for the reboot.

How to get back to the previous version of MIUI?

⚠️ Attention: Firmware rollback will delete all data! make a backup through Settings → Additionally. → Backup and reset.

1. Download the correct version MIUI (For example, 12.5.3.0 instead of 13.0.2.0).
2. Go to Recovery Mode (Food) + Loudness up).
3. Choose Wipe & Reset → Wipe Data (full reset!).
4. Then Install. update.zip and specify the downloaded file.

💡

If after the update the phone began to warm up, check the settings of the processor. MIUI 13+ By default, High Performance mode is enabled, which overclocks Helio G35/G80 to the temperature limit. Switch to Balanced to Settings → Battery and productivity → Performance mode.

7. Disabling unnecessary services MIUI Google

MIUI And Google Services runs dozens of background processes that eat up RAM and battery power?

Services MIUI, deactivable:

• 📊 Analytics (statistics collection) - Settings → Confidentiality → Analytics → Shut down.
• 🔔 Mi Push Service (Notifications from Xiaomi) – Settings → Notifications → System notifications → Shut down.
• 🎵 Music and Video (built-in players) - Settings → Annexes → Shut down.
• 📡 Mi Roaming (if you do not use roaming) - Settings → SIM-maps and mobile networks → roaming → Shut down.

Google services that can be restricted to:

• 📍 Google Play Services – Limit background activity in Settings → Annexes → Google Play Services → Battery → Limit background activity.
• 🔍 Google App – Turn off Voice Search and Activity Tracking.
• 📱 Android System Intelligence – responsible for “smart” prompts, you can disable.

How to turn off through ADB (power-user)?

Some system applications cannot be deactivated through the menu.

adb shell pm disable-user --user 0 com.xiaomi.mipush

com.xiaomi.mipush

💡

Disabling Google Play Services will completely disrupt many apps (e.g. YouTube, Gmail) and limit only background activity.

8. Alternative methods: if nothing has worked

If Redmi 9 is still slowing down after all the manipulations, try radical measures.

Method 1. Resetting to factory settings

⚠️ Warning: This will delete all data, including photos, messages and installed apps. pre-backup via Mi Cloud or Google Drive.

1. Settings → Additional → Backup and Reset → Reset settings.
2. Choose Delete all data and confirm.
3. After reset, do not restore data from the backup immediately – check the speed of the “clean” system.

Method 2. Install custom firmware (requires unlocking the bootloader)

If you're ready to experiment, try LineageOS or Pixel Experience. MIUI and do not contain unnecessary services.

• 🔓 Unlock the bootloader through the Mi Unlock Tool.
• 📥 Download the firmware from the forum XDA.
• 🛠️ Set it through TWRP Recovery.

Method 3: Replace thermopaste (if the phone overheats)

If Redmi 9 is braking because of overheating, the problem may be with the dried thermal paste.

• The phone is heated even when it is simple.
• Performance drops after 10-15 minutes of play.
• The back cover is hot in the processor area.

The solution is disassembly and replacement of thermopaste (it is recommended to contact the service center).

FAQ: Frequent questions about Redmi 9 acceleration