How to Optimize Xiaomi Mi 9: 15 Proven Ways to Speed Up Your Smartphone in 2026

The Xiaomi Mi 9 is still one of the brand’s most popular flagships, despite the release of new models. However, over time, even powerful hardware begins to slow down: applications take a long time to load, the battery dies in a few hours, and the system emits errors, the reason is not a weak Snapdragon 855 processor, but accumulated digital garbage, outdated settings and unoptimized software.

In this article, 15 working optimization methods that will return your Mi 9 to its previous speed, we will examine both basic settings (clearing the cache, turning off the background) and advanced tricks (overclocking). GPU, battery calibration All instructions are relevant to MIUI 14 and Android 13, but they'll be good for earlier versions, no root rights or risk manipulation, just secure ways, proven on hundreds of devices.

Important: Before you start optimizing, check the free space in memory – if less is left. 10%, At least release it first. 15-20 GB: Otherwise, the system will not be able to work correctly with temporary files, and all efforts will be in vain.

1. Diagnostics of the current state of the smartphone

Before optimizing, you need to understand what exactly is slowing down your Mi 9, using built-in tools and third-party utilities.

Open Settings → About the phone → System status. Here you can see:

• 🔋 Battery health – if below 80%, calibration or replacement is required.
• 📱 Memory usage is critical if occupied >90%.
• 🔄 Running time – if the screen is on for less than 3 hours when fully charged, look for “gluttonous” apps.

For deep diagnostics, install AccuBattery (battery analysis) and DevCheck (iron monitoring).

• 📊 Processor temperature under load (norm up to 65)°C).
• ⚡ Real battery capacity (original - 3300 mAh).
• 🖥️ Downloading CPU/GPU background.

If you see in DevCheck that the Snapdragon 855 is loaded on 70%+ In simple, it's a sign of background activity of viruses or of a curved optimized program.

2. Cleaning the system: remove garbage and cache

The first step of optimization is to free up memory from unnecessary files. 9 s 64/128 GB of memory is critical: the system reserves up to 10 GB for your needs, and the user is little.

Cleaning methods:

1. Built-in utility: go to Settings → Memory. → Clean. Click "Deep Clean" and delete:

Hand cleaning.

Files. → Categories → Multimedia.

• 📸 Screenshots over 3 months old.
• 🎥 Videos from messengers (they take gigabytes!).
• 🎵 Downloads from the browser (especially) APK-file).

Install for automation SD Maid (requires root only for deep cleaning) The app will find:

• 🧹 Residual files of remote programs.
• 🔍 Empty folders.
• 🗃️ Duplicate documents.

⚠️ Attention: Do not clean the folder MIUI The root of memory is system files, their deletion will lead to failures!

3. Battery optimization: calibration and power settings

Mi battery 9 through 3-4 the year of operation loses 30% But even with a worn-out battery, you can extend the time you're running on. 20-40% correct settings.

Step. 1. Calibration of the battery (needed if the smartphone is turned off when 20-30% charge):

1. Charge your phone to 100% (use the original power supply).
2. Turn off the charge and wait for the automatic shutdown.
3. Connect the charging and, not including the smartphone, wait 100%.
4. Turn on the device and reset battery statistics in Settings → Battery → ⚙️ → Reset the statistics.

Step 2: Energy saving settings:

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After calibration of the battery, perform 2-3 full charge/discharge cycle (from 0 before 100%), so that the charge controller adapts to the actual capacity.

Step 3: Disabling unnecessary functions:

• 📡 Continuous search Wi-Fi/Bluetooth — turn off the settings → Wi-Fi → Additionally. → Networking.
• 📍 Geolocation – leave only for maps and taxis, other applications are forbidden.
• 🔔 Auto-update applications – allow only over Wi-Fi or turn off completely.

System Acceleration: Disable animations and background processes

MIUI It's known for its beauty, but animations and visuals slow down the interface:

Method 1. Through the developer settings:

1. Activate Developer Mode: Settings → About Phone → MIUI version (click 7 times).
2. Back to Settings → Additionally. → For developers and install:

Method 2: Optimization MIUI:

• 🔄 Go to Settings. → Special opportunities → Simplified mode – this will remove unnecessary widgets.
• 📱 B Settings → Screen. → Permission set. FHD+ instead WQHD+ (if there is no difference).
• 🎨 Turn off the dark theme if you use it. AMOLED-effects – they eat up to 5% of the charge.

Method 3: Forced stopping of applications:

Some programs (like Facebook or TikTok) continue to work in the background even after they are closed, to stop them:

1. Open Settings → Applications → Application Management.
2. Choose a "glutty" app → Forced stopping.
3. Disallow Auto Start: Settings → Battery → Choice of applications → set limits.

5. firmware update: how to properly stitch Mi 9

Outdated firmware is one of the main reasons for the brakes. Xiaomi regularly releases patches for the Mi 9, correcting errors and optimizing performance. OTA (In the air, it does not always work smoothly.

Safe ways to update:

Step-by-step instructions for updating through Recovery:

1. Download the latest stable firmware for Mi 9 (codename cepheus) from the official website.
2. Rename the file to update.zip and place it in the root of the memory.
3. Press Power + Vol Up to enter Recovery.
4. Select Install update.zip and wait until it is completed.

⚠️ Note: If after the update, the smartphone stuck on the logo MI, Wait. 10-15 If it doesn't work, reset via Wipe Data (the data will be deleted!).

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Before firmware, be sure to make a backup through Settings → Additionally. → Backup. That'll save the contacts, SMS Settings, not photos – copy them manually!

6. Optimizing gaming performance

The Mi 9 with the Snapdragon 855 and Adreno 640 still pulls on modern games like Genshin Impact or Call of Duty Mobile, but you need to adjust the graphics correctly.

Settings for maximum FPS:

• 🎮 Enable Game Turbo in Settings → Special opportunities → Game Turbo.
• 🔧 In the game settings, set up:
• ⚡ Turn off vertical sync (V-Sync) in the developer settings.

Additional tricks for gamers:

• 🔋 Connect the game controller over Bluetooth – this will reduce the load on the sensor.
• 📶 Use 5 GHz Wi-Fi for online gaming (less ping).
• ❄️ Refrigerate your smartphone at temperatures above 70°C occurs trottling (automatic productivity decline).

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For monitoring FPS In games, install GameBench (requires root) or Performance Overlay (no root, but with limitations).

If the game still lags, try lowering the screen resolution to HD+ In Settings → Screen. → Permission. That'll give you an increase. FPS on 15-20%.

7. Reset to factory settings: when and how to do

If all the optimization methods don't work, there's a hard reset, which is a radical method, but it will bring the smartphone back to the factory state, removing all the accumulated errors.

When you need a reset:

• 🐢 The system brakes even after cleaning.
• 🔄 Apps are constantly flying out.
• 📱 The smartphone overheats without loading.
• 🔋 Battery sits down for 1-2 hour (after calibration).

How to reset your settings:

1. Make a backup (see the section on firmware).
2. Go to Settings → About the phone → Reset settings.
3. Choose Delete all data and confirm.
4. After the reboot, set up your smartphone as new.

⚠️ Note: Do not recover data from the backup MIUI And when you reset, it'll bring back the old mistakes. Install the applications manually and reconfigure them.

After discharge:

• 🚀 Don’t install all programs at once – add them to the 2-3 On a day to track down the "glutty».
• 🔒 Turn off auto-start for all applications in Settings → Permits → Auto-start.
• 📥 Do not copy old files from your PC – many of them may have been corrupted.

8. Alternative firmware: should you install a caste?

If you've exhausted all the optimization options, but the Mi 9 is still unstable, you can look at alternative firmware.

• ⚡ Higher productivity (by removing the Bloatware).
• 🆕 Latest versions of Android (for example, LineageOS 20 based on Android 13).
• 🔧 Flexible settings (kernel, GPU, CPU).

Popular firmware for Mi 9:

Risks of custom firmware:

• 🚨 Loss of warranty (if it is still valid).
• 🔋 Battery issues (some firmware not optimized for Mi 9).
• 📱 Possible bugs (not working) NFC, camera.).

If you decide on a cast, follow the exact instructions for your model (cepheus) and back up all sections through the TWRP. It will be necessary to unlock the loader:

1. Link the Mi Account to the device.
2. Wait 7 days (compulsory requirement of Xiaomi)
3. Use the Mi Unlock Tool.

FAQ: Frequent questions about optimization of Xiaomi Mi 9