Xiaomi Redmi 9 phone brakes: what to do to accelerate in 2026

Xiaomi Redmi 9 is one of the most popular budget smartphones, but over time even it begins to “hang”: apps open for a long time, animations twitch, and the system reacts with a delay. If your Redmi 9 is slower, do not rush to buy a new phone. In 90% of cases, the problem can be solved by software methods – from simple cache cleaning to fine-tuning MIUI.

In this article, we will look at all possible causes of brakes – from overloaded memory to outdated firmware – and give step-by-step instructions for eliminating each. We will pay special attention to the specifics of the Redmi 9 (model M2003J15SC), its “weak spots” (4 GB of RAM, Helio G80 processor) and optimization under MIUI 14/15. Also consider when it makes sense to upgrade the hardware (for example, replace the drive with a faster eMMC 5.1), and when “software resuscitation” is sufficient.

1.Diagnostics: Why did Redmi 9 start to brake?

The brakes on the Xiaomi Redmi 9 are usually due to one or more of these reasons before starting treatment:

• 📱 RAM shortage: 4GB of RAM on Redmi 9 is quickly clogged with background processes, especially if you use instant messengers (Telegram, WhatsApp) and social networks.
• 🗑️ Cache: Temporary application files and systems can take up to 5-10 GB of memory, slowing down.
• 🔄 Outdated firmware: versions MIUI older than 13.0.5 have memory optimization bugs that are patched in new updates.
• 🦠 Viruses or malware: Some applications (especially from third-party sources) can load the processor in the background.
• 🔋 Worn-out battery: With battery health levels below 80%, the system automatically limits performance.

To determine the exact source of the problem, check:

1. Go to Settings → About Phone → MIUI version and make sure you have the latest firmware installed.
2. Open Settings → Applications → System state and see what processes are loading the CPU.
3. Use the AccuBattery app (free on Google Play) to check the battery health.

⚠️ Attention: If the phone starts to brake abruptly (for example, after a fall or moisture), the problem may be hardware - a damaged motherboard or a departing plume.

2.Cache and garbage cleanup: the first step to speeding up

The most common cause of brakes is filled memory. On Redmi 9 with factory eMMC 5.1, read/write speeds drop 30-40% when less than 10% of the space is free. Cleaning up cache and unnecessary files can give performance gains of up to 20-30%.

Clearing the application cache

Cash speeds up the programs, but over time it accumulates and slows down the system, to clean it up.

1. Go to Settings → Applications → Application Management.
2. Select an app (like Facebook or Instagram) and click Clear Cache.
3. For mass cleaning, use Settings → Storage → Clean (Clean button at the bottom).

2.2. Deletion of unnecessary files

Use the built-in Storage Analysis:

• 📁 Go to Settings. → Warehouse → Analysis of the vault.
• 🔍 See categories Large files, downloads, duplicates.
• 🗑️ Remove unnecessary videos, APK-files, backups.

For deep cleaning, we recommend Files by Google – it finds garbage that built-in MIUI tools miss (for example, the remains of remote applications).

3. MIUI Optimization: Hidden Settings for Acceleration

MIUI has many hidden features that can be used to speed up Redmi 9, many of which are disabled by default to "simplify" the interface for regular users.

3.1. Cancel animation

Animations make the interface look better, but they slow down weak phones to turn them off.

1. Activate Developer Mode: Settings → About Phone → MIUI version (click 7 times).
2. Back to Settings → Additionally. → For developers.
3. Find the items: Window Animation Scale → Off. Size of Transition Animation → Off. Duration of the Animator → Off.

Limitation of background processes

By default, MIUI allows applications to run in the background, which eats up RAM. To limit them:

• 🔧 Go to Settings. → Battery and productivity → Battery management.
• 📱 Select Settings → Limitation of background processes.
• 🔄 Set a limit on 2 processes (or a standard balance limit).

Switch to “Easy Mode”

If the phone is slowing down, try the Easy Mode:

1. Open Settings → Special Opportunities → Easy Mode.
2. Activate the switch and restart the phone.

This mode disables visual effects and simplifies the interface, which gives a performance increase of up to 15-20%.

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If the phone is faster after the animations are turned off, but the interface seems “sharp”, return the animation scale to 0.5x – this is a compromise between speed and smoothness.

4.Firmware Update: Why it's important for Redmi 9

The performance of Xiaomi Redmi 9 is highly dependent on the version of MIUI. For example, in firmware older than MIUI 12.5, there was a memory management bug that caused applications to spontaneously close. In new versions (MIUI 14+), this bug was fixed, and optimization features were added:

• 🔄 Dynamic RAM Expansion (virtual increase in RAM due to internal memory).
• 📉 Intelligent resource allocation for games and heavy applications.
• 🛡️ Improved protection against background processes loading the system.

To update the firmware:

1. Go to Settings → About the phone → System update.
2. Click Check Updates and wait for the download.
3. If the update does not come, download it manually from the official Xiaomi website (choose the version for Redmi 9, the code model Lancelot).

⚠️ Note: If you have custom firmware installed (like LineageOS or Pixel Experience), upgrading through the standard menu can lead to brick (turning your phone into a brick) in which case, flash only through Fastboot or TWRP.

5. Reset to factory settings: when necessary

If all the previous methods didn't work, the last software method is hard reset, which will delete all the data, but return the phone to its original speed. On Redmi 9, resetting helps in cases where:

• 🔄 System files damaged after failed update.
• 🦠 Phone infected with a virus that is not removed by antivirus.
• 📱 There are too many “junk” settings and cache.

How to reset:

1. Save important data (photos, contacts) to Google Drive or computer.
2. Go to Settings → About the phone → Reset settings.
3. Choose to erase all data and confirm.
4. After restarting, set your phone as new.

⚠️ Note: If you used the bootloader unlock or installed custom Recovery (TWRP), Resetting via the settings menu can result in a bootloop ( looped reboot).In this case, reset via Fastboot command: fastboot -w

6 Hardware Methods: When Software Optimization Does Not Help

If Redmi 9 is slowing down even after all the software manipulations, the problem could be the hardware.

Replacement of the storage device with a faster

The Redmi 9 has eMMC 5.1 memory, which degrades over time, and if the read/write speed drops below 100MB/s (checked through AndroBench), you can replace the memory chip with a new one.

• ⚡ Increased reading speed to 250 MB/s (for eMMC 5.1 of the new sample).
• 📈 Reducing lags when launching applications.
• 🔄 Longer service life of the phone.

Cost of replacement: 1500-2500 ₽ (depending on the region).

Replacement of the battery

If the battery is less than 80% healthy, MIUI automatically limits performance to reduce heat, and replacing the battery with a new one (5020 mAh, original or quality) will return the full power of the processor.

Dust cleaning and thermal paste replacement

Overheating is a common cause of brakes, and if the phone is heated above 45°C (checked through AIDA64), you should:

• 🧹 Clean the charging connector and speakers from dust (you can compressed air).
• 🔧 Replace the heat paste on the processor (requires disassembly of the phone).
• 📱 Check the operation of the cooler (if installed).

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Replacing the storage or battery is justified if the phone is used intensively (games, video shooting, multitasking).

7. Alternative firmware: should you switch to caste?

If standard MIUI is slowing down even after all the optimizations, you might consider installing custom firmware. Redmi 9 is popular with:

• 📱 Pixel Experience – pure Android without unnecessary services MIUI.
• 🔄 LineageOS – stable firmware with long support life.
• ⚡ Evolution X – Optimized for gaming and performance.

The advantages of custom firmware:

• ✅ There is no built-in garbage (bloatware) from Xiaomi.
• ✅ Faster security updates.
• ✅ Possibility of fine tuning of the kernel (kernel).

Cons:

• ❌ Loss of warranty (if it is still valid).
• ❌ The risk of brick with incorrect firmware.
• ❌ Certain functions (e.g, IR-blaster) may not work.

If you decide to cast, follow this algorithm:

1. Unlock the bootloader through the official Xiaomi tool.
2. Install TWRP Recovery (Lancelot version).
3. Download the firmware with XDA Developers.
4. Sweat through TWRP, having previously made a backup.

FAQ: Frequent questions about brakes on Redmi 9