Xiaomi Redmi Note 9 Pro brakes and lags: full instructions for acceleration

Xiaomi Redmi Note 9 Pro is one of the most popular mid-range smartphones, but even it slowly slows down, with apps opening for a long time, animations twitching, and sometimes the device is completely “thought out” for a few seconds, and 80% of the time the problem is solved by software methods without repairing or replacing components.

The causes of brakes can be divided into three categories: system overload (too many background processes), memory shortage (cache or lack of RAM), and software failures (firmware errors, viruses). In this article, we will discuss all possible solutions from basic to advanced, including hidden MIUI settings, which are rarely mentioned in standard instructions.

Important: If your Redmi Note 9 Pro doesn’t just brake, but spontaneously reboots or shuts down when you’re on load, the problem may be the battery or the processor overheating. In such cases, check the body temperature (normal to 40°C) and battery status in the Settings → Battery status menu first.

1.Diagnostics: Why is your Redmi Note 9 Pro slowing down?

Before you start "treatment", you need to identify the root of the problem, brakes can occur due to:

• 📱 Clogged memory: less than 10% of free space on the internal drive.
• 🔄 Outdated Firmware: The Update Version MIUI For the Redmi Note 9 Pro — MIUI 14 (Android 12).
• 🧹 Garbage files: application cache, remnants of deleted programs, duplicate photos.
• 🦠 Viruses or malware: especially if installed APK unverified.
• 🔋 Worn-out battery: with a capacity below 70%, the system forcibly limits performance.

To determine the cause, follow the following steps:

1. Open Settings → About Phone → MIUI version and check the relevance of the firmware.
2. Go to Settings → Memory and see how much free space is left.
3. Run Security → Scan for Viruses.
4. Install the AIDA64 app (free on Google Play) and check the CPU temperature (CPU → Temperature) and battery status (Battery → Capacity).

Critical: If the AIDA64 battery capacity is less than 3,500 mAh (at the initial 5020 mAh), the brakes are associated with performance limitations due to battery wear, in which case only replacement will help.

2. Cleaning up memory and cache: quick ways

The most common reason for brakes is a lack of space on the internal drive, the MIUI system requires a minimum of 3-5 GB of free space for stable operation, if there is less, lags begin.

How to make room:

• 🗑️ Delete unnecessary files through Files → Cleaning (built-in application) Pay special attention to Download folders, DCIM (photo/video and WhatsApp/Media.
• 🧹 Clear the app cache: Settings → Annexes → Application management → [Select an application] → Memory. → Clear the cache.
• 📁 Move files to microSD or cloud. For photos/video, use Google Photos with Free up space».
• 🎮 Remove heavy games (such as Genshin Impact or Call of Duty Mobile) that take up the game. 2-4 GB.

For deep cleaning, use the built-in Optimization tool:

1. Open Security. → Optimization.
2. Press Deep Clean and wait for the scan to be completed.
3. Delete any unneeded files found (including remnants of deleted applications).

⚠️ Warning: Do not use third-party cleaners such as Clean Master or CCleaner.They often delete important system files and can aggravate the brakes. MIUI All the necessary tools are already in place.

3. Optimization of applications and background

The Redmi Note 9 Pro has 6GB of RAM, but even that may be lacking if there are a dozen apps hanging in the background.The MIUI system aggressively manages memory, but sometimes manual tuning is required.

How to reduce the load:

• 🚫 Turn off auto-run of unnecessary apps: Settings → Annexes → App management. Select an app (like Facebook or AliExpress). Click Autorun and turn it off.
• ⚡ Enable Performance Mode: Settings → Special facilities → Performance mode. Select High performance (increased battery consumption!).

1. Settings → Battery and performance → Background process management.
2. Select Strict Limits for Unnecessary Applications.

For game lovers, there is a hidden feature called Game Turbo that optimizes performance:

1. Open Settings → Special features → Game Turbo
2. Add games to the list and enable Performance Optimization.

💡

If the app gets worse after cleaning the cache (for example, YouTube is loading a video for a long time), just restart it.

4. Update firmware and reset settings

Outdated firmware is one of the main reasons for the brakes. Xiaomi regularly releases updates that correct errors and optimize performance. The current version for the Redmi Note 9 Pro (codename joyeuse) is MIUI 14 based on Android 12.

How to update:

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 the firmware manually from the official MIUI Downloads website (choose the Redmi Note 9 Pro version marked Global).
4. Install the update via Settings → System Update → Three Dots → Select a firmware file.

If the update didn't work, try resetting to factory settings. This is a radical method, but it removes all software conflicts:

1. Make a backup of the data through Settings → Additional → Backup and Reset.
2. Go to Settings → About the phone → Reset settings.
3. Choose to erase all data and confirm the action.

⚠️ Note: After the Redmi Note reset 9 Pro may be the first 10-15 It's okay to go a little slower than usual, and it indexes files and optimizes background processes!

5. Battery and overheating problems

Over time, the battery capacity decreases, and the system begins trottling (forced performance reduction) to reduce energy consumption. If your Redmi Note 9 Pro runs out in 3-4 hours and slows down, the problem is the battery.

How to check the status of the battery:

1. Install AccuBattery (free on Google Play).
2. Charge your phone to 100% and see the real capacity in the Health section.
3. If the capacity is below 3500 mAh (originally 5020 mAh), the battery is worn out by 30% or more.

Decisions:

• 🔋 If the capacity is higher 4000 mAh, try calibrating the battery: Discharge the phone to 0% (Charge until it's off. 100% without interruption (use the original adapter on the 33 Repeat the cycle 2-3 once.

• Are not the vents closed (for example, a cover).
• Does the phone work in direct sunlight?
• Are there any heavy games or benchmark tests running (e.g. 3DMark)?
• 🔄 Enable the Power Saving Mode (Settings) → Battery and performance → Energy saving mode, but note that this will limit productivity.

⚠️ Warning: Sloppy changes in the developer settings can lead to unstable phone performance or data loss. If you are not sure, it is better not to touch these settings!

💡

Turning off animations gives you 15-20% increase in speed, but visually the system will become less smooth, and this method is suitable for those who care about the speed of opening applications, not the beauty of transitions.

Extreme measures: flashing and iron replacement

If none of the above has worked, there are two options:

1. Fastboot flashing will help if the brakes are caused by damage to system files. Instructions: Download the official firmware for joyeuse (codename Redmi Note 9 Pro) from MIUI. Install the Mi Flash Tool on your PC. Connect the phone in Fastboot mode (clutch Volume down + Power when the phone is off). Follow the instructions in Mi Flash Tool (select Clean All option).
2. Replacement of components: If the brakes are accompanied by spontaneous reboots or artifacts on the screen, the problem may be in the RAM or the processor. In this case, only the service center will help — 1500-2000 Replacement of the display (if the brakes due to a damaged screen) — 3000-5000 Diagnostics of the motherboard — 500-1000 ruble.

Before reflashing it is necessary:

• Make a backup copy of all data (photos, contacts, messages).
• Charge your phone at least 50%.
• Use the original. USB-cable (low-quality cables may interrupt the process).

FAQ: Frequent questions about the Redmi Note 9 Pro brakes