Modern smartphones, including the popular Xiaomi Redmi Note 9 Pro, have a powerful hardware, but over time, even the fastest devices start to work slower. The main reason for this behavior is often crowded system cache and accumulated temporary application files, which are created to speed up access to frequently used information, but when they are too much, they begin to slow down the MIUI operating system.
Regularly cleaning temporary files allows not only to free up precious space in internal memory, but also significantly extend the battery life of the gadget. Users often notice that after proper cleaning the phone starts charging faster, and applications start instantly. In this article, we will discuss in detail all available methods of memory optimization for your model.
Why you need regular cleaning of the cache on MIUI
The Android operating system that runs the MIUI shell is designed to store its own temporary data, which can be image thumbnails, intermediate results, or interface elements, and over time, this data can reach several gigabytes, which is critical for models with a small amount of internal memory.
Ignoring the need to clean leads to the processor spending more resources on finding the right files among the debris, which causes micro-slowdown of the interface and increased heating of the case, and crowded cache often causes programs to malfunction when they fly out immediately after launch or freeze during the boot phase.
It’s important to understand the difference between cache and important user data. Clearing temporary files won’t affect your photos, contacts, or instant messaging. However, deleting app data (not to be confused with cache) can reset your program settings to factory ones, so you should always read carefully what you’re going to delete.
⚠️ Warning: Before doing a deep cleanup, always make sure you have an up-to-date backup of important data in the cloud or on an external medium.
💡
Set a rule: carry out preventive cleaning of garbage files every two weeks to maintain high system performance without sudden drops in speed.
Use of the built-in Security application
The easiest and safest way to clear the cache on the Redmi Note 9 Pro is to use a regular developer tool. Xiaomi preinstalles the Security app, which combines the functions of an antivirus and a memory cleaner, a method that is suitable for most users who do not want to delve into the technical settings.
To start the process, you need to find a green shield icon on your desktop. Once you open the application, the system will automatically scan the device for malware and temporary files, usually in 10-15 seconds, after which a report with recommendations will appear on the screen.
☑️ Quick cleaning algorithm
Once you have finished scanning, you will see a Clean button that will delete all temporary files found, and the system will also prompt you to remove the remnants of deleted applications and advertising debris, a basic level of maintenance that should be performed regularly to maintain the stability of the operating system.
⚠️ Attention: The memory acceleration feature in this app closes the background processes, which can lead to faster battery discharge the next time heavy applications are launched.
Manually cleaning the cache of individual applications
Sometimes global cleaning doesn’t solve a problem with a particular application that takes up an abnormally large amount of space, and in such cases, you need to use manual memory management through system settings, which allows you to pinpoint the cache of heavy programs such as Telegram, Instagram or YouTube without affecting their basic settings.
To get to the menu, go to Settings and select the App. Next, click on All Apps and find the program you want in the list. Inside the app menu, you are interested in the Memory or Storage section, where you will see two values: the size of the application and the cache size.
Click on Clear Cache (not to be confused with Clear Everything if you want to save logins and passwords) This method is especially effective for social networks, which accumulate a huge amount of media files in temporary storage, after this procedure, the application will run as a first time, but your data will remain in place.
Why is the app cache growing so fast?
Cleaning the hidden system cache through Recovery
There is a deeper level of cleanup available through Recovery Mode, a method that removes temporary files from the operating system itself that are not visible in normal operation, which is safe if you follow instructions and helps with updates or strange behaviors on your smartphone.
To enter recovery mode, you need to turn off the Redmi Note 9 Pro completely. Then press the volume button and the power button at the same time. Hold them until the Mi logo appears, after which the phone will go to the Recovery menu. The volume buttons control the phone and the power button confirms the choice.
In the menu that opens, select the language (if available) or go straight to Wipe Data. Here, it is important to choose the option Wipe Cache, not Wipe All Data, otherwise you will lose all personal files. Confirm the action, and the system will perform a deep cleaning of the system partition.
⚠️ Note: In Recovery mode, navigation may not be as responsive as in normal mode. Press the buttons carefully and slowly, so as not to select the wrong menu item.
Once the process is complete, the phone will suggest restarting, and the first run after cleaning it up may take longer than usual because the system will need to re-form the necessary temporary files, which is normal behavior, indicating successful completion of the procedure.
Memory analysis and file type table
For effective space management, it is important to understand which files occupy space on your device. Android divides memory into several logical partitions, each with its own purpose, and understanding this structure will help you make informed decisions about what to delete and what to leave.
Below is a table describing the main types of data stored in the memory of Xiaomi Redmi Note 9 Pro, and recommendations for their processing:
| Type of data | Description | Can I remove it? | Impact on the system |
|---|---|---|---|
| System cache | Temporary OS files | Yes, it's safe. | Accelerates work, frees up space |
| Application data | Settings, logins, saves | No (resets settings) | Drop the program to the factory. |
| Media files | Photos, videos, music | Just a little extra. | Frees up a lot of space. |
| APK files | Installation packages | Yes, if it's installed. | Safe disposal of garbage |
When analyzing memory, you should pay attention to the Download and DCIM folder. Often users forget about downloaded files or duplicate photos. Regular audit of these sections allows you to keep the device clean without using third-party software.
Third-party utilities for advanced users
If there is not enough regular funds, you can turn to time-tested third-party solutions. However, when installing such programs on Xiaomi, you need to be extremely careful, since some of them may contain advertising or collect unnecessary data.
One popular utility is SD Maid or Files by Google, which can find files left over from uninstalling programs and duplicate documents, and provide a more detailed report of deer disk space than a standard MIUI analyzer.
When using third-party software, be sure to check the permissions you request. If a simple cleaner requires access to your contacts or location, it's a reason to be wary. Data security in a modern smartphone is as important as free space.
💡
In 95% of cases, MIUI staff funds are sufficient to maintain the cleanliness of the system, the installation of additional software is justified only for specific tasks.