The Xiaomi Mi 9 series, powered by the flagship Snapdragon 855 processor, is still powerful enough to handle most modern tasks. However, over time, even the top hardware faces a shortage of RAM and an overflow of internal storage. Users often notice that the interface is slowing down and apps are loading longer than usual, signaling the need for maintenance.
The main reason for the decline in productivity is the accumulation of digital debris, residual files of remote programs and sprawling social media cache. The MIUI operating system has powerful tools to combat this problem, but they require proper use to achieve maximum effect without the risk of losing important data.
In this article, we will discuss proven methods to safely and efficiently free up gigabytes of space on your device, learn how to distinguish useful system files from malicious junk and what hidden features are available to Android smartphone owners.
Standard cleaning tools in MIUI
The first and safest step is to use the built-in Security app, which is pre-installed on all Xiaomi devices, which is designed specifically for the MIUI shell file system and can correctly delete temporary files without disrupting the integrity of the operating system.
When working with a standard cleaner, it is important to pay attention to the categories of files that the system suggests to be deleted. Often, the “Cash” section may contain data for offline maps or music tracks from streaming services that you plan to listen to without the Internet. Careful analysis of each item before confirming the removal will help avoid unpleasant situations with loss of content.
💡
Use the “Accelerate” function in the notification curtain before launching heavy games to force the background processes to close and free up RAM.
To fine-tune the device, you can use the advanced purifier settings, which allow automatic cleaning options when a certain memory occupancy threshold is reached, and use this method regularly keeps the device in good shape and prevents critical storage from filling up.
- 🧹 Click the Clean Up button to delete temporary system and application files.
- 📸 Check the Photos section to find similar shots and screenshots that can be removed.
- 📦 Use the Apps tab for uninstall programs you haven’t used in over a month.
- 🗑️ Don’t forget to clean the gallery cart, as deleted photos are often stored there for another 30 days.
It is worth noting that Xiaomi’s built-in algorithms are sometimes too conservative to touch the files of some popular messengers, considering them important, so after the standard procedure, it is recommended to manually review the folders with media files.
Deep cleaning of the cache of messengers and social networks
The main consumers of free space on the Xiaomi Mi 9 smartphone are Telegram, WhatsApp and social networks, which store every picture, video and voice message viewed into local memory, creating giant archives of data that are often not visible during standard file system browsing.
The most effective way to combat bloated cache is to use built-in memory management within the apps themselves. For example, Telegram has a great caching mechanism that allows you to automatically delete media files over a certain period, freeing up space without losing correspondence. On WhatsApp, a similar feature is available through the Data and Storage menu.
Why does the cache take up so much space?
Manual cleaning through Android settings also gives good results, but requires caution. Going down the Settings → Apps → All apps path, you can find a specific application and select Clear Cache. It is important not to confuse this item with the Clean Everything button, as it will lead to a complete application reset and loss of authorization.
| Annex | The path to cleanup | Security of removal | Impact on data |
|---|---|---|---|
| Telegram | Settings → Data and memory → Memory use | Tall. | It doesn't affect the correspondence. |
| Settings → Data and Storage → Storage Management | Tall. | Preserves text of messages | |
| Phone Settings → Applications → Clear the cache | Medium | Re-entry required | |
| TikTok | Profile → Three stripes → Free space | Tall. | Drafts can be removed |
Regularly checking these sections allows you to control tens of gigabytes of space, especially for users in hundreds of groups and channels where media files are exchanged around the clock.
Storage analysis and removal of large files
It often happens that the place is occupied not by small system files, but by large objects forgotten by the user: recorders, downloaded movies, navigation files or backups. To identify such heavyweights in the shell of MIUI, there is a convenient storage analyzer.
Going to Settings → Memory, you'll see a visualization of the space allocation by category, and the system itself tells you which folders are taking up the most space, and suggests you go to their contents, which is much more effective than blindly deleting files through a Explorer without understanding their purpose.
Special attention should be paid to the Download folder and browser directories, where APK installation files from updated programs can accumulate. Older versions of installers are no longer needed and take up valuable space on the internal Xiaomi Mi 9 drive.
It's also a good idea to check the DCIM →.thumbnails folder, which stores thumbnails of your gallery photos, and over time, this file can grow to several gigabytes, and it can be safely deleted, but it will be recreated the next time you start the gallery, so it's best to do this periodically before important shoots.
- 🎬 Search for video files in the Video folder and delete failed take or old screen recordings.
- 🎵 Check your music player folders for tracks you no longer listen to.
- 📂 Use size sorting in the explorer to see the largest files right away.
- ☁️ Consider transferring archived photos to cloud storage to relieve local memory.
Deleting unnecessary large files is the fastest way to get a few gigabytes of free space in just a few minutes. Remember that for stable Android operation, it is recommended to keep at least 10-15% of the total memory free.
Removal of system debris and residual files
When you delete applications, Android often has so-called “tails” — empty folders, error logs and configuration files. On the Xiaomi Mi 9 with its fast UFS memory, these files do not significantly affect read speed, but they clog the file table.
To combat this, you can use specialized analyzer utilities such as Files by Google or SD Maid, which scan the system for orphaned files that do not belong to any installed program and offer them to be safely deleted.
⚠️ Note: When using third-party cleaners, be extremely careful with items marked as "Systems." Only remove what you are sure of, or rely on the recommendations of the app itself marked "Safe».
Another source of debris is debugging logs and error reports, which can be cleaned through the developer menu if you have it activated, but it is easier for the average user to use the deep cleaning feature in a standard security application by selecting the Full Clean mode.
Regularly doing this, for example, once a month, will help keep the file system in order, especially before installing major system updates that require a significant amount of free space to unpack and install.
Optimization of work and speeding up the interface
After physical memory cleaning, it is advisable to optimize the operation of the interface. AMOLED-It's a high refresh rate screen, and it needs resources to run the animations smoothly.
It is recommended to disable or limit the work of applications that you do not need in the background. Go to Settings → Battery and Performance → Restricting application activity and select the “No Limits” mode for instant messengers only, and set “Energy Savings” for the rest.
☑️ Daily optimization
It is also worth reducing the number of live wallpapers and widgets on the desktop, each active widget consumes processor resources and RAM, which in total can put a significant strain on the system, especially when there is a lack of free memory.
Remember to reboot. Many users stay on their smartphones for months, causing memory errors and fragmentation. A typical once-a-week reboot works wonders for Xiaomi’s performance.
Prevention and healthy habits
To avoid the question of “how to clean your phone” too often, it is worth developing useful digital habits: Regular hygiene of a smartphone takes less time than emergency resuscitation of a clogged device.
Set up automatic cleaning in messengers and prevent auto-save media from unfamiliar chats, which will save you thousands of random pictures and gifs that stealthily eat gigabytes, and it is also useful to audit installed applications once a month.
⚠️ Warning: Never delete files from Android system folders manually through Explorer unless you know exactly what they are responsible for.
Using cloud services to store photos and documents is the best way to unload the built-in drive. Xiaomi Mi 9 perfectly syncs with Google Photos and Google Drive, allowing you to store originals in the cloud, and only leave previews on the device.
💡
Systematic cache cleaning and removal of unused applications prolong the life of the battery and maintain high speed of the smartphone for years.
Compliance with these simple rules will allow your Xiaomi Mi 9 to remain fast and responsive even after years of active use.