Modern smartphones like Redmi 9 have a powerful hardware, but they get slower over time, because of the accumulation of temporary files that Android and MIUI systems create to quickly download frequently used data, and if you notice that the interface slows down and apps open longer than usual, then it's time to clean up the storage.
Cache cleaning is a safe and effective procedure that does not delete your personal photos, contacts or documents, unlike a full reset, it only affects business information. Regular maintenance allows you to extend the life of the device and keep its performance at a high level even a year or two after purchase.
In this article, we’ll look at all the cleanup options available, from simple actions through settings to advanced methods through recovery mode, and learn to distinguish useful cache from junk files, and understand when to really intervene and when to trust automation.
What is cache and why you need to clean it
Cache is a memory area where you store temporary data from apps and systems, for example, when you open a news site, its logo and header are stored in memory so that the next time you log in, the page loads instantly, which speeds up work, but over time, these files can reach several gigabytes in size.
The problem arises when cache files become corrupted or redundant.The application can start to malfunction, fly out or freeze when it starts.In the case of Xiaomi Redmi 9, which is based on the MIUI shell, a crowded cache of system services can cause the case to heat up and quickly discharge the battery.
- 🚀 Acceleration of the interface and program launch
- 🗑️ Freeing up valuable space of internal memory
- 🔧 Elimination of errors in the operation of specific applications
- 🔋 Reducing the load on the processor and battery
⚠️ Cache clearing does not delete your logins and passwords in most cases, but it may require re-authorization on some social networks or banks.
Modern Android algorithms manage memory quite efficiently, but if you're actively using heavy games or graphics editors, manual cleaning will become a useful habit once every couple of weeks.
Cleaning the cache through the standard Security app
The easiest and safest way for Redmi 9 owners is to use the built-in Security tool, which is a system application that cannot be removed and has deep access to the file system, and it automatically scans the device for junk files and suggests that they be deleted.
To start, look for a green shield icon on your desktop. Run the scan, wait for the analysis to be completed. The system will show the amount of debris occupied. Press Clean to delete temporary files. This method removes the safe system debris without touching the important application data.
There are advanced features inside the app, and if you go to Cleanup, you can see a more detailed breakdown by category, and you can selectively remove the cache of large apps, like Telegram or YouTube, which often take up the most space.
☑️ Checking before cleaning
Sometimes, a built-in cleaner may miss some hidden files, and then you should use the deeper cleaning methods that we'll discuss below, but a standard tool is enough for daily maintenance.
Removing the cache of individual applications in the settings
If a particular program is unstable, for example, Instagram constantly crashes or photos are not uploaded to Viber, you need to clean the cache of this particular application. Global cleanup here may not help, since the problem is localized.
Go to the Settings menu, then select the App and All Apps. In the list that opens, find the problem program. Click on it to open the management page. Here you are interested in the Memory button or the immediately available Clean option.
It is important not to confuse the Clear Cache and Clear Everything (or Reset) buttons. The first deletes only temporary files, the second erases all data, including accounts and settings, returning the application to state immediately after installation.
| Action. | What's removed | Safe. |
|---|---|---|
| Clearing the cache | Temporary files, thumbnails | Yes. |
| Clearing the data | Logins, settings, saves | No (to enter) |
| Deletion of the annex | Complete removal of the program | No. |
| Stopping. | Forced closure of the process | Yes. |
Once the cache is cleared, it is recommended that the application be closed completely through the menu of running tasks and reopen it, which will allow the system to create new, correct temporary files from scratch.
Why is the cache growing so fast?
Using Recovery Mode for Deep Cleaning
Recovery Mode is a special diagnostic interface built into Xiaomi firmware that allows you to perform system operations before the operating system boots, and cleaning the cache through this mode is the most thorough, since it deletes temporary files of system processes that cannot be deleted with Android running.
To enter recovery mode on Redmi 9, you need to turn off your phone completely. Then press the volume button and the power button at the same time. Hold them until the Mi logo appears, then release the power, but keep the volume down. In a few seconds, a menu with a black background will appear.
Volume Up + Power Button = Recovery ModeNavigation in this menu is done with volume buttons (up/down), and the choice is confirmed by the power button. You need to find the Wipe Data item. In some versions of MIUI, it may be called differently, but the essence is the same. Inside, select the option Wipe Cache. The system will warn about the consequences, confirm the action.
⚠️ Warning: Never select "Wipe All Data" from the Recovery menu unless you want to completely erase your phone with all your photos and contacts.
After completing the process, which usually takes a few seconds, select Reboot to reboot.The first launch of the system may take longer than usual - this is normal, as Android reassembles system resources.
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If the buttons in Recovery do not respond, try connecting the phone to your computer through the USB-cable, on some versions. MIUI This activates touch control in recovery mode.
Automatic cleaning with extensions
The MIUI shell on Redmi 9 supports custom add-ons right from the settings, legal system modules that extend the functionality of standard applications, including powerful memory management tools.
Go to Settings → Extensions. Here you will find a list of available plugins. Find and install a module related to memory cleaning or system optimization (the name can vary depending on the version of MIUI, often called Memory Extension or Cleaner). Once installed, it is integrated into the standard service menu.
These extensions work in the background and can automatically clear the cache when the free memory level drops below a certain threshold.This saves the user from having to manually start cleaning.
- 📲 Automatic start with a shortage of space
- 🛡️ Protection against overflow of the system partition
- ⚙️ Deep integration with the core of the system
- 📊 Real-time memory usage statistics
Using third-party apps from the Google Play store (like Clean Master and analogues) on modern versions of Android is often useless.The system restricts their access rights, and they can't clear the cache more efficiently than Xiaomi's built-in tools.
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Built-in MIUI tools are always more effective than third-party accelerators, as they have system-level rights and do not require unnecessary permissions.
Frequent questions and troubleshooting
Even with simple actions, there may be questions: users often worry about data safety or look for reasons why memory is not released. Below are answers to the most popular queries related to maintenance of Redmi 9.
Is it safe to clean the cache every day?
Where do the photos go after cleaning the cache?
Why does the place end quickly after cleaning?
Can cleaning the cache damage the phone?
What to do if the phone freezes after cleaning?
Regular maintenance of your Xiaomi Redmi 9 is the key to its long and stable operation. Using the described methods, you can avoid buying a new device for a long time, simply keeping the software part clean.