Xiaomi’s Redmi 9 series has been popularized with its excellent value for money. However, over time, even powerful devices are slowing down and space-short notifications are becoming more frequent. It’s a natural process of accumulating system debris, app cache and forgotten files. Understanding how to free up space will help extend the life of a gadget without buying a new one.
Owners often wonder why memory fills up so quickly when there are few photos, because MIUI actively caches data to speed up work, and messengers save every photo or video they see. Competent storage optimization requires a comprehensive approach that includes both standard tools and manual cleaning.
In this article, we’ll take a look at all the cleaning techniques available, from simple settings to advanced developer features. You’ll learn which files can be deleted without risk to the system, and how to prevent an internal drive from filling up quickly in the future. Follow the instructions to make your Redmi 9 run fast and responsive again.
Analysis of vault occupancy
Before you start taking action, you need to determine exactly what takes up precious gigabytes. Android provides built-in tools for data visualization, but the MIUI shell has more detailed reports. Go to the settings and find the memory section to see the distribution of space between applications, images and system files.
It often turns out that the data is not the software itself, but the data. Social networks and instant messengers tend to grow to giant sizes, preserving the history of correspondence and media files. Analysis (employment) allows you to identify such heavyweights and decide whether to clean them or delete them.
Note the Other category, which may be hiding remnants of deleted programs, download service packs, or temporary files, and if this partition takes up a disproportionate amount of space, you may need to clean up more deeply or even reset your settings, but for now, we'll limit it to standard methods.
⚠️ Warning: Before deleting any files from the Other category or system folders, make sure they do not contain important documents. Data backup is a mandatory step before drastic measures are taken.
Use of the built-in Security application
The easiest and safest way to start cleaning is to use the pre-installed Safety app. This is a standard tool from Xiaomi that is deeply integrated into the system and has access to all the necessary partitions to remove garbage. Launch the app and select Clean up.
The scanner will automatically analyze the device for temporary files, ad residues and browser cache, and once the scan is complete, the system will prompt you to remove the debris found at the touch of a button, a basic level of maintenance that is recommended to be performed regularly.
☑️ Weekly express cleaning
Inside the app, you can also find a Deep Clean section, where you can find large files, duplicate photos and rarely used apps, and it's especially useful for finding forgotten videos that can take up hundreds of megabytes.
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Use the "Accelerate" function in the Security app at the same time as cleaning, which will free up RAM, which will also have a positive effect on the speed of the interface.
Manual cleaning of cache and application data
Automatic cleaners don’t always handle the cache of heavy apps like YouTube, TikTok or Telegram, and they can accumulate gigabytes of temporary data that the system doesn’t always correctly define as garbage, requiring manual intervention through settings to effectively deal with them.
Go to Settings → Applications → All apps. Sort the list by size of space. When you select the largest app, click on it and select Memory. Here you will see two buttons: Clear cache and Clear everything.
Using the Clear Cache button is secure and will not cause personal data such as logins or correspondence to be lost. It only deletes temporary files, speeding up the program. The Clear All button (or Reset) will return the application to state immediately after installation, removing all your settings and authorizations.
| Type of cleaning | What's removed | Risk of data loss | Recommended frequency |
|---|---|---|---|
| Clearing the cache | Temporary files, thumbnails | No. | Once a week. |
| Clearing the data | Settings, logins, databases | High-pitched | When there is a failure |
| Deletion of the annex | All content of the program | Total loss. | If not used |
| Removal of updates | System patches of the application | Low. | When you make mistakes |
⚠️ Note: Do not use the WhatsApp, Viber feature unless you have a fresh backup. You will lose your entire correspondence history without the ability to restore it.
Work with Gallery and Cloud Services
Multimedia files traditionally take up the most space on smartphones. The Redmi 9 camera takes high-quality pictures that weigh a lot, especially if high-resolution shooting is enabled. Regularly transferring photos and videos to a computer or to the cloud is the best way to free up internal memory.
The built-in Google Photos app or Xiaomi Gallery allows you to set up automatic sync. Once copies of files are saved to the cloud, you can use the Free Space feature, which will remove the originals from the device, leaving them available for viewing online.
Also worth checking is the Recycle Bin folder in the gallery. Deleted photos often stay there for 30 days, continuing to take up space. Recycle Bin cleaning is an instant way to get extra gigabytes. Remember to check the folders in the file manager where images from messengers may have been saved.
Hidden folders with media files
Removal of system debris and residual files
Even after you delete applications, you may still have their tails — empty folders, configuration files, and error logs — and you can use Xiaomi’s built-in File Manager Explorer to find that data, and it can analyze folder structure and tell you which ones you can safely delete.
Note the Download folder, and browsers and files received via Bluetooth or messengers are often downloaded and forgotten. APK-installer, PDF-Documents and archives can lie for months, uselessly using the storage resource.
Another source of garbage is a folder. MIUI It's inside the root directory, and it stores the error report logs. debug_log) If you're not debugging the system, the contents of the folder are debug_log You can remove it safely. It can free up a lot of space.
For advanced users, cleaning through developer mode is available, but this requires caution. The average user is better off checking standard directories and using the Cleanup function in Explorer, which scans the device for large and duplicate files.
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Regular check of the Downloads and Cart folder in the gallery can free up to 2-3 GB of free space every month without installing additional software.
Optimization through Developer Mode
There's a hidden section for developers on Android where you can find useful memory management tools, and you have to click on the build number several times in the About section to activate it, and when you see the appropriate item in the settings, you'll be able to access the new features.
One useful option is to limit background processes, so you can prevent the system from holding more than a certain number of applications in memory, which will not clean the memory directly, but will prevent it from being filled quickly with active processes, which is especially true for models with 3 or 4 GB of RAM.
Also in this section, you can find statistics on memory usage by running services, which helps to identify system processes that consume too much resources, but you should only change the settings here if you understand the consequences, because incorrect actions can lead to unstable interface operation.
⚠️ Warning: Do not disable system processes that you do not know what they are doing, which can cause calls, internet or interface to crash. MIUI. Be selective in settings for developers.
Using third-party utilities for cleaning
If there is not enough regular funds, you can turn to proven third-party solutions, the market leader is the Files by Google app, which safely removes duplicates, blurred photos and temporary files, it works softer than aggressive cleaners and does not load the system with advertising.
Other popular utilities, such as SD Maid or CCleaner, offer deeper file system analysis, can find remnants of remote programs in the registry (analogue) and system folders, and when using such programs, carefully read what they suggest to delete.
It's important not to install multiple antiviruses and cleaners at the same time, and they can conflict with each other and with MIUI, causing the opposite effect of slowing down and quickly discharging the battery. One quality tool for maintenance is enough.