How to increase the performance of Xiaomi Redmi 9T: from software settings to hardware tricks

Why Redmi 9T is starting to brake and how to fix it

Xiaomi Redmi 9T with Snapdragon 662 and 4-6 GB of RAM initially demonstrates decent performance for the budget segment. However, over time, many users face slowdowns: applications open long, animations twitch, and games appear friezes.

First, clogging of the system — app cache, residual files after deleting programs and duplicate media files occupy the precious space of eMMC 5.1 (embedded memory). Second, background activity: MIUI aggressively keeps processes in memory even when they are not needed. Third, thermal throttling — when the processor overheats, artificially reduces frequencies, which leads to FPS drawdowns and lags.

The good news is that 80 percent of problems are solved by software without disassembling the phone. In this article, we'll look at the unique optimization techniques for the Redmi 9T, including the hidden MIUI 12/13 settings and the hardware cooling tricks. Let's start with the simplest ways and get to the radical measures for advanced users.

1. Cleaning the system: remove garbage and free up memory

The first step is to clean up files in depth. On the Redmi 9T with 64/128 GB of storage, even 10-15 GB of free space can make a critical difference in read/write speed.

• 🧹 Cache Clearing: Go to Settings → Warehouse → Clean up. Click "Clean" under "Junk Files." Pay special attention to "App cache" -- it often accumulates 1-3 GB of unnecessary data.
• 🗑️ Remove duplicates: Use the built-in Files app (from Google) or Cleaner app (from Xiaomi).In the "Analysis" section, find duplicate photos, videos and documents.
• 📦 Storage optimization: In the same Warehouse menu, tap on "Free space". MIUI Remove unused items APK, downloads and old screenshots.

For avanzado cleaning, install SD Maid (from APKMirror, because Google Play removed it).

• Residual files after uninstallation of programs (orphaned files)
• Empty folders in /sdcard/DCIM/.thumbnails
• System Logs (/data/log) that can be deleted securely

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Before mass deletion of files, back up important data through Settings → Additional → Backup and Reset. MIUI allows you to save a copy to Mi Cloud or locally.

⚠️ Note: Do not manually delete files in folders /system or /vendor — It's going to crash the system. It requires root rights to work with system partitions.

2. MIUI Optimization: Hidden Settings for Acceleration

MIUI 12/13 on Redmi 9T has hidden features that reduce resource consumption, most of which are hidden in the developer and special features section:

1. Go to Settings → About the phone

2.Shoot 7 times on the item "Version" MIUI"

3. Return to the main settings menu - a new section "For developers" will appear"-->

Now turn on these options:

Additionally, disable app auto-update in Google Play (Settings → App Auto-Update → Never) and sync unnecessary accounts (Settings → Accounts), which quietly eat up to 500MB of RAM.

Once a week | Once a month | Only when the phone starts to brake | Never clean-->

3. Application Management: What can be safely disabled

Redmi 9T comes pre-installed with Xiaomi services, many of which run in the background and slow down the system. Here is a list of safe apps to disable (don’t delete them completely, just turn them off via settings):

• 📱 Mi Browser – the default browser, consumes up to 300 MB of RAM even in the background
• 🎵 Mi Music and Mi Video – replaced by Google Play Music and YouTube
• 📊 Analytics – Xiaomi statistics collection service (sends data to China)
• 🛒 GetApps – a branded app store, duplicates Google Play
• 📢 MSA (Mi Service Framework – Responsible for Xiaomi push notifications

To disable system applications:

1. Go to Settings → Applications → Application Management
2. Select the desired application → Disable
3. Confirm the action (some applications will require a password)

⚠️ Warning: Don’t disable Google Play Services, Miui Daemon or Security – this will cause key phone features, including internet access and fingerprint scanner, to fail.

For advanced users, ADB can remove pre-installed apps without root permissions, connect your phone to your PC and follow the command:

adb shell pm uninstall -k --user 0 com.miui.browser

Replace com.miui.browser with the desired application package (a list of packages can be found through adb shell pm list packages | grep miui).

4. Battery and thermal optimization

Overheating is one of the main reasons for the processor throttling on the Redmi 9T. At temperatures above 45°C, the Snapdragon 662 automatically reduces core frequencies, leading to performance drawdowns.

• 🌡️ Track the temperature through the app AIDA64 or CPU Monitor. Normal temperature in plain - 30-35°C, under load, up to 40°C.
• 🔋 Turn off fast charging (if not urgent): go to Settings → Battery → Quick charging and deactivate the option. This will reduce heating during charging.
• ☀️ Avoid direct sunlight and do not use your phone while charging for resource-intensive tasks (games, video editing).

For emergency cooling:

• Remove the case (especially silicone – it retains heat).
• Use a cooling stand with a fan (even a laptop stand will do).
• Reduce the brightness of the screen to 50-60% – AMOLED-display (in Redmi 9T it is IPS, but the principle is the same) strongly warms at the maximum.

Also check the battery status in AIDA64 → Battery. If the capacity has dropped below 80% of the nominal (6,000 mAh), the battery starts to heat up faster and needs to be replaced.

5. Firmware and Updates: When They Help and When They Harm

MIUI updates often bring not only new features, but also hidden bugs that can slow down the phone. For example, MIUI 12.5.3–12.5.5 for Redmi 9T had a memory management bug that caused apps to spontaneously restart.

Check the current firmware version in Settings → About Phone → MIUI Version. Current stable versions for Redmi 9T (codename juice):

• MIUI 13.0.8 is the latest stable version based on Android 11
• MIUI 14.0.2 – the first stable version on Android 12 (can slow down on weak configurations)

If the phone is getting worse after the update:

1. Make a cache reset via Recovery: 1. Turn off phone 2. Press Power + Volume Up before the MI 3 logo appears. Select Wipe Cache Partition 4. Reboot
2. Reverse to the previous version via Fastboot (instructions on 4PDA or Xiaomi Firmware Updater).

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Before updating your firmware, always back up your Settings → Additional → Backup. This will allow you to recover data if the new version of MIUI is unstable.

Alternatively, custom firmware like Pixel Experience or LineageOS, which lacks the heavy MIUI interface and often works faster, will require:

• Unlock the bootloader (Mi Unlock Tool)
• Install custom Recovery (TWRP)
• Sweep ZIP-firmware

⚠️ Attention: Installing custom firmware voids the warranty and may result in a brick (complete inoperability) of the phone. 9T Problems with work are also known NFC and wide-angle camera on unofficial firmware.

6 Hardware Improvements: What Can Be Done Physically

If the software methods didn't work, consider hardware improvements. They require disassembling the phone, so only do them if you have experience or in a service center.

• 🔄 Thermopaste replacement: Over time, the factory thermopaste dries up, which worsens the heat sink. Use a high-quality paste (Arctic) MX-6 noctua NT-H2).
• 🔋 Battery replacement: After 500 charging cycles, battery capacity drops by 20 to 30 percent, leading to overheating and sudden shutdowns.The original battery for Redmi 9T articulate MB0F.
• 🖥️ MicroSD Installation: Class Memory Cards A2 (for example, Samsung EVO Plus) allow you to transfer some applications, reducing the load on the built-in memory.

To replace the thermal paste:

1. Disassemble the phone by following the Redmi 9T guide (e.g. iFixit).
2. Carefully remove the radiator from the processor (it is glued).
3. Remove the old paste with alcohol, apply the new with a thin layer.
4. Check the temperature after assembly - it should drop by 5-10 ° C.

If you're not ready to disassemble the phone yourself, contact the service center.Average cost for Redmi 9T:

Radical methods: resetting and flashing

If all previous methods have not helped, there are extreme measures:

• 🔄 Hard Reset: Deletes all data and returns the phone to factory settings. → Additionally. → Backup and reset → Resetting settings.
• 📱 Fastboot Reflash: Complete Reinstallation MIUI It's using the Mi Flash Tool. It requires an unlocked bootloader.
• 🔧 Related: Android 10 rollback: Some users note that Redmi 9T It runs smoother on an older version of Android. 4PDA.

Before discharge:

1. Save your data to your PC or cloud (Mi Cloud or Google Drive).
2. Write down the phone's IMEI (type *#06#).
3. Make sure your phone is at least 50% charged.

⚠️ Attention: After a hard reset of Redmi 9T If you forget the login details, the phone will become a “brick” (you can’t get around the lock without an official unlocker from Xiaomi).

FAQ: Frequent questions about Redmi optimization 9T