Smartphone Xiaomi Mi 9T, known as the Redmi in China K20, It is still one of the most popular devices due to its high-quality AMOLED-But with the release of new versions of the shell. MIUI And when you update applications, you often notice that you're less responsive and you're more micro-latency, and it's a natural process of software aging that requires a holistic approach to solving this problem.
The problem of slowing down RAM and storage is relevant for many devices released several years ago. Unlike flagships with a power reserve, the mid-range segment, which includes the Mi 9T, requires more attention to background processes.
In this guide, we'll look at not only standard cleaning techniques, but also hidden engineering menus that allow you to radically change the behavior of the processor. You don't need to be a programmer to do these things, but you need to be careful when working with system settings. We'll look at each step in detail to rule out possible errors.
Diagnostics of the current state of the system
Before you start to take action, you need to understand what exactly is loading system resources of your device. Often the brakes are not running applications, but background services that consume battery power and CPU time. The MIUI shell has built-in monitoring tools, but they do not always show the full picture.
The first step is to analyze the occupancy of the built-in storage, where when the free disk space drops below 10-15 percent, the speed of writing and reading data drops critically, and this is due to the peculiarities of the flash memory, which requires space for the algorithms to align wear. Check the Settings → Memory section and assess the situation.
⚠️ Warning: Do not fill the device's internal memory with a minimum. 3-5 GB free space for correct operation of the system cache and temporary application files.
Then you have to look at the temperature of the case and the processor. Overheating is a powerful trigger for trotting, which is to force the cores to lower their frequency to avoid damage. If your Xiaomi Mi 9T is hot even in plain plain sight, the problem can be the physical wear of the thermal interface or battery degradation, which also affects the voltage and stability of the operation.
📊 What’s the most important thing about your Xiaomi Mi? 9T?
MIUI interface
Launching applications
Camera.
Games
All at once.
Cleaning and optimizing storage
The most effective way to speed up the Xiaomi Mi 9T without flashing is to clean up junk files in depth. Xiaomi’s standard “Security” app often works superficially, leaving gigabytes cache away from messengers and social networks. For more thorough cleaning, it is recommended to use advanced snails or manual cleaning through the file manager.
Particular attention should be paid to the folder Android/data, But you have to be careful: removing excess files will speed up work, but can reset authorization in some programs. → Annexes.
- 🗑️ Remove old downloads in the Download folder that have been taking up space for years.
- 📸 Check the gallery for duplicate photos and videos in high resolution.
- 💬 Clean up the Telegram and WhatsApp cache as they grow to huge sizes.
- 📱 Remove unused apps that hang in the background.
After physical file cleanup, it makes sense to defragment, although in modern Android, it happens automatically. To initiate forced optimization, you can use the Acceleration mode in the standard security application. It is also useful to reboot the device after cleaning, so that the file system rebuilt the indexes.
Customization of animations and MIUI interface
Visual smoothness is the first thing that catches the eye of the user. Animations of opening windows, transitioning between menus and folding applications create a sense of speed. On the Xiaomi Mi 9T with its AMOLED screen, animations look beautiful, but they consume GPU resources. Scaling or turning them off can significantly increase subjective speed.
To access these settings, you need to activate the developer mode. Go to Settings → About phone and quickly press 7 times on the line "Version" MIUI». After the message “You became a developer” appears, go back to the main settings menu, select “Advanced” and find the item “For developers».
Inside the developer menu, we're interested in three parameters related to rendering: Find the items "Scale of window animation", "Scale of transition animation" and "Duration of animation." They are 1x by default. Change them to 0.5x or completely disable (0x), if you care about maximum responsiveness, not the beauty of the effects.
| Animation parameter | Standard value | Recommended for speed | Impact on the system |
|---|
| Window animation | 1x | 0.5x | High. |
| Animation of transitions | 1x | 0.5x | Average. |
| Duration of animation | 1x | 0.5x | Low. |
| Background processes | Standard. | No more than 4. | Critical |
Also on the developer menu, you should find the option “Background processes” or “Background process limit”: setting a limit on the number of simultaneous applications (for example, up to 3-4 pieces) will free up a significant amount of RAM, this is especially true for the Mi 9T versions with 6 GB of RAM, which in 2026 are already considered minimally comfortable.
Should I turn off animations completely?
Complete shutdown of animations (0x) It makes the interface twitchy and less understandable, it makes it harder for the eye to track where the window came from and where it disappeared — 0.5x, It retains the logic of navigation, but works twice as fast.> Removing Ads and System Garbage One of the Reasons Why Xiaomi Mi 9T can work slowly, is a constant loading of advertising modules of the system. MSA (MIUI System Ads and other components consume Internet traffic and CPU time even when you don't see pop-ups. Disabling ads is not just a matter of comfort, it's a matter of performance. Start by turning off personalized ads on your Mi Account. Go to Settings. → Passwords and security → Access your personal data and find the "msa" option. Turn off the slider and wait 10 seconds until the "Revoke" button is active». The system will try to dissuade you, but you have to insist on your own, then you have to go through the built-in applications and turn off the recommendation, this is for the application "Security", "Conductor", "Downloads" and "Music". In each of these settings, you need to find the "Get recommendations" item and deactivate it, which will prevent the background loading of news feeds and promotional materials. 🚫 Shut down the service. MSA in authorization settings. 📉 Remove the “Receive recommendations” boxes in all system applications. 🌐 In the Security app, turn off memory acceleration if it causes lags. 🔒 Disable access to the advertising ID in the privacy settings, and after this action, the system will become “easier” because it will stop constantly polling Xiaomi servers for new advertising campaigns. It will also have a positive impact on battery life, as the network module will be less likely to activate in the background. Autoboot and Background Control Control Control Control Control over which applications run with the system and remain in memory is key to speeding up work. MIUI has an aggressive energy management system, but it is not always effective against voracious applications like social networks or marketplaces. For manual control, go to Settings → Apps → Auto Launch. Here you will see a list of programs that start immediately after the phone is turned on. Leave only messengers (if important), notifications, and other systems, including news stores. ⚠️ Note: Do not disable auto-start for system components whose names contain «MIUI», «System, Framework, or Google, which can cause your phone to run out of order or lose communication, and you can also set limits for the background activity of specific applications. → Annexes → All apps, select a heavy app (like Facebook or Yandex), click on “Saving Charge” and select “No Limits” only if you need background downloads. Otherwise, select “Limit background activity.” If the software optimization methods did not give the desired result, the last and most effective way remains - a complete reset to factory settings. This procedure removes all user debris, accumulated registry errors and conflicts after multiple updates. For Xiaomi Mi. 9T This is often the only way to get back to the old days. Before you start, make sure to back up your sensitive data, you can use the Mi Cloud cloud, Google Drive, or transfer files to your computer. Remember that after reset, all photos, contacts and installed applications will be deleted without recovery. → The phone. → Resetting settings → Delete all data. The system will request the unlock password and the password from the Mi Account. Once confirmed, the process will begin, which will take 5 to 15 minutes. The phone will reboot several times. Settings -> The phone -> Resetting settings -> Erase all data After turning on, don't rush to install all the apps at once. Set your phone up as new, install only the minimum programs you need, and watch your speed for a couple of days. It often turns out that without “heavy” software, the device works perfectly. 💡Full reset eliminates 95% of software causes of slowdown by removing accumulated system debris and configuration file conflicts over the years. Is it safe to use third-party accelerators from the Play Market? Most of the accelerator apps (Clean Master and analogues) in modern versions of Android are more likely to harm than help, they aggressively unload processes from memory, forcing the system to immediately start them again, which puts additional strain on the processor and battery. MIUI Will Root-right speed up Xiaomi Mi? 9T? Obtaining superuser rights (Root) allows you to remove system debris and deeply customize the kernel, but it’s a tricky way to go. For the average user, the risks (loss of warranty, the possibility of “bricking”, broken banking applications) outweigh the potential performance gains that can be obtained by safe methods. Does battery wear affect the speed of operation? Yes, it affects directly. When the battery is badly worn, it can not give the required current at peak load moments. The CPU protection system detects a voltage drop and artificially lowers the frequencies so that the phone does not turn off. If the phone is already 3-4 years old, replacing the battery can do wonders with performance. Do I need to install antivirus on? For the average user, who is not using Xiaomi, who only visits the antivirus from Google Play, and does not need to visit the antivirus. The built-in scanner in the Security app (based on the Avast or Tencent engine) copes with basic protection without wasting unnecessary resources.