What to do if the brakes Xiaomi Redmi 9: full instructions for acceleration

Xiaomi Redmi 9

In this article, we will discuss all possible ways to accelerate Redmi. 9 — From basic to radical, you'll learn how to diagnose a problem, what settings you're setting. MIUI They affect performance, and when you think about repairs, we'll focus on the specific bugs in the firmware. MIUI 12/13, The most common brakes are on this model.

If your phone is slow all of a sudden — like when you upgrade or install a new app — it's probably solved in 10 minutes, but if you've been pileing up lags for months, you'll need a comprehensive approach. Let's start with the simplest one.

1.Diagnosis: Why your Redmi 9 is slowing down

Before you start "treatment", you need to understand the cause. Redmi 9 slows down for 5 main reasons:

• 📱 Lack of RAM: 3-4 GB of RAM quickly clogged with background processes, especially if you use instant messengers and social networks.
• 🗃️ Completed storage: when filling the memory at 90%+ Redmi 9 is especially sensitive to this because of the budget memory controller.
• 🔄 Outdated firmware: MIUI 12 and older contain optimization errors for Helio G80 (Redmi 9 processor).
• 🔥 Overheating: If the body is hot, the processor automatically lowers the frequency (trottling), which causes lags.
• 🔋 Worn-out battery: When degraded below 80% of capacity, the phone can spontaneously limit performance.

To determine your situation, perform simple checks:

1. Open the Settings. → The phone. → Battery condition: If the capacity is below 85%, the battery is the problem.
2. Run Settings. → Memory and see how much space is left. Less than 5GB is the critical threshold.
3. Install the app CPU Monitor (from Google Play) and check if the CPU frequency decreases when loaded.

If the brakes appeared after a specific action (for example, updating or falling the phone), the reason is easier to find.

2.Relieving memory: quick ways

Let's start with the obvious -- cleaning up memory. - Redmi 9 has 32/64 GB of internal memory, and even if you haven’t installed many apps, the system can be clogged with cache and junk files.

Step 1. Cleaning the app cache

Cache speeds up the software, but over time it accumulates and takes up gigabytes to clean it up.

1. Go to Settings → Applications → Application Management.
2. Select the most “heavy” app (e.g. Facebook, TikTok, Google Chrome).
3. Press Warehouse. → Clear the cache.

For mass cleaning, use the built-in tool:

1. Open Settings → Memory → Cleaning.
2. Press Deep Cleanup and confirm the action.

Step 2: Delete unnecessary files

MIUI Creates duplicate photos, temporary files, and error logs to find them:

• 📁 Use Google Files (application preinstalled). Go to the Cleanup tab and delete: Screenshots (folder) Pictures/Screenshots) Downloads (Download folder) Duplicate photos (Duplicate tab)
• 🎵 Remove casing music from Spotify, Yandex Music or VK Music (application settings) → storage).

Step 3: Transfer data to a memory card

If you have a microSD model (up to 512GB), transfer to it:

• 📸 Photo and video (via Gallery) → highlight files → Move it)
• 🎮 Game data (in the game settings, select Move to SD-map)
• 📥 Downloads (in Files, click on the Download folder) → Move it)

If less than 10% of memory is free after cleaning, consider resetting to factory settings (more on this below).

3. MIUI Optimization: Hidden Settings for Acceleration

MIUI — It's a customized Android shell, and it has features that can both help and slow down the system, and we'll turn off unnecessary chips and activate hidden performance modes.

Disabling animation and visual effects

Animations make the interface look more beautiful, but they consume resources.

1. Activate Developer Mode: Go to Settings → About Phone and click on MIUI Version 7 times.
2. Back to Settings → Additionally. → For developers.
3. Find the items: The scale of window animation → No animations The scale of transition animation → Without animation The scale of animation duration → No animation.

Disabling application background activity

Many programs continue to work in the background even when you're not using them, to limit them:

1. Go to Settings → Applications → Application Management.
2. Select an app (such as Instagram) → Background restriction → Limit.
3. For mass shutdown, use Settings → Battery → Power saving mode and select Limit background activity.

Activation of the performance mode

MIUI It has a hidden mode for games, but it can be used for general acceleration:

1. Open the Settings. → Special facilities → Performance mode (if no item, skip step).
2. Switch on Acceleration. GPU and memory optimization.
3. B Settings → Display set the refresh rate of the screen at 60 Hz (if it stood 90 Hz – this will reduce the load on the processor).

💡

If after disabling animations, the interface seems “sharp”, return the scale to the 0.5x — It is a trade-off between smoothness and productivity.

Disabling unnecessary system applications

MIUI It contains many pre-installed programs that cannot be removed but can be “freezed»:

1. Install. ADB AppControl (PC required).
2. Connect your phone to your computer and execute the command: adb shell pm disable-user --user 0 com.miui.analytics (this will disable Xiaomi analytics collection).
3. Similarly, disable: com.miui.daemon (background processes) MIUI) com.xiaomi.midrop (Mi Drop if not used) com.miui.videoplayer (standard video player)

4. Update and reset firmware

If Redmi 9 is slowed down after the update MIUI If you're not updated, you might have a problem with software errors, and if you look at two scenarios, upgrade to the latest version and roll back to stable firmware.

Step 1. Check the current version MIUI

Go to Settings. → The phone. → Version. MIUI. If the version is older MIUI 13.0.5, be sure to update:

1. Open Settings → Update the system.
2. Click Check for updates.
3. If an update is available, download it and install it (requires at least 50% battery life).

Step 2: Manual update via Recovery

If OTA-update is not working:

1. Download the latest firmware for Redmi 9 (codename Lancelot) from Xiaomi’s official website.
2. Rename the file to update.zip and move to the root of the phone’s memory.
3. Turn off the phone, then press Volume Up + Power to enter Recovery.
4. Select Install update.zip and confirm the installation.

Step 3: Reset to factory settings

If the update didn't work, do a hard reset.This will delete all data, so back up first:

1. Go to Settings → About Phone → Backup and Reset.
2. Select Resetting → Erase all data.
3. After restarting, set your phone as new.

Step 4: Reverse to stable firmware

If the lags appeared after the update (for example, before the update) MIUI 14), you can go back to the previous version:

1. Download the required firmware (for example, MIUI 12.5.7) from the Xiaomi.eu forum.
2. Install it through Recovery (similar to Step 2).
3. After the rollback, reset the settings.

💡

If after resetting the phone still brakes, the problem is more hardware (battery, memory, processor).

5. Checking hardware problems

If software methods have failed, the reason for the brakes may lie in the "iron". Redmi 9 has typical "diseases" that manifest after 2-3 years of use.

Problem 1: Battery wear and tear

When the battery degrades below 80% of capacity, the phone begins to limit performance.

1. Install AccuBattery from Google Play.
2. Charge your phone to 100% and check the battery health score.
3. If the value is below 80%, the battery needs to be replaced.

Problem 2: Processor overheating

Helio G80 prone to overheating, which causes trottling (automatic frequency reduction:

1. Install. CPU Throttling Test.
2. Run the test: If the graph shows a drop in frequency under load, the processor overheats.
3. Solutions: Remove the case (it can block the heat sink). Use the phone in a cool room. Apply a new thermal paste (disassembly required).

Problem 3: Memory malfunction

The cheap 5.1 eMMC memory in Redmi 9 degrades over time.

• 🐢 Slow recording/reading of files.
• 🔄 Self-involved reboots.
• 🚫 Errors in the installation of applications.

Check your memory health with AIDA64 (tab → Read/write test: If the speed is below 100MB/s, the memory is worn out.

Problem 4: Damage to plumes or boards

If the phone fell or got wet, it could be damaged by:

• 📶 Antenna plume (leads to the network brakes).
• 🔌 Battery plume (causes sudden shutdowns).
• 🖥️ Motherboard (requires diagnosis in the service).

💡

If the phone is only braking when connected to a charge, check the power supply. Unoriginal charges can cause voltage drawdowns, which cause the processor to work unstable.

⚠️ Attention: If the brakes are increased after battery replacement or repair, it is possible that the master damaged the thermal paste or plumes.

6. Radical methods: custom firmware and replacement of components

If none of these things work, there are extreme measures that require technical skills, but they can bring the phone back to speed.

Method 1. Installation of custom firmware

Stock-stock MIUI Alternative firmware (like LineageOS or Pixel Experience) is faster:

1. Unlock the bootloader via Mi Unlock Tool (requires a Xiaomi account and wait 7 days).
2. Install. TWRP Recovery for Redmi 9 (instructions for the game) XDA).
3. Download the firmware (e.g. Havoc-OS) and install it through TWRP.

Advantages:

• 🚀 No extra apps. MIUI.
• 🔄 Regular security updates.
• 🎨 Ability to fine-tune productivity.

Disadvantages:

• ⚠️ Loss of warranty (if it is still valid).
• 📱 Certain functions (e.g, IR-blaster) may not work.

Method 2: Replacement of thermopaste

Over time, the heat paste between the processor and the radiator dries up, causing overheating.

1. Disassemble the phone (need a mediator and a screwdriver). T3).
2. Clean the old paste with alcohol.
3. Apply a new thermal paste (such as Arctic) MX-4).
4. Collect your phone and check the temperature in AIDA64.

Method 3: Replacement of memory or processor

If tests show critical wear on eMMC memory, it can be replaced. However, it is expensive (from 3000). ₽) The alternative is to buy a used Redmi 9 with working memory on a donor board.

Method 4: Buying a new phone

If the repair costs more than 50% of the cost of the new Redmi, it makes sense to consider an upgrade.

• 📱 Redmi Note 12 (from 15,000) ₽) — Snapdragon 4 Gen 1, 120Hz screen.
• 📱 POCO M6 Pro (from 13,000) ₽) — Helio G99, 67W charging.
• 📱 Redmi 13C (10,000 ₽) — Budget option with Helio G85.

⚠️ Warning: When buying a used Redmi 9, be sure to check the battery status (#4636## → If your health is below 85%, drop the deal - the battery will soon need replacement.

7.Alternative solutions: cloud services and lightweight applications

If you can't speed up the phone, you can optimize the use of the phone. Here are some life hacks:

Use of lighter versions of applications

Many popular programs have lightweight versions:

• 📘 Facebook Lite instead of Facebook.
• 💬 Messenger Lite instead of the main messenger.
• 🌐 Opera Mini or Chrome Go instead of Chrome.
• 📷 Gallery Go instead of Google Photos.

Transfer applications to the cloud

If memory is severely lacking:

• 📁 Store your photos in Google Photos (up to 15 GB free).
• 🎵 Listen to music via YouTube Music or Spotify (don't download tracks).
• 📄 Edit documents in Google Docs or Microsoft Office Online.

Using the phone as a "thin customer"

If Redmi 9 is slowing down even in basic tasks, plug it into a more powerful device:

• 🖥️ Scrcpy – Controlling a phone from a PC (consumes computer resources).
• 🎮 Cloud Gaming – Play through Xbox Cloud Gaming or GeForce NOW (not loading the phone).
• 📺 Miracast – display screen on the TV (in Settings) → Connection and sharing → Wireless display).

Disabling Automatic Updates

App and system updates can slow the phone down in the background to limit it:

1. In Google Play: Settings → Auto-update of applications → Never.
2. B Settings → System Update: Turn off Automatic Booting via Mobile Network.

FAQ: Frequent questions about Redmi 9 brakes