Modern smartphones like the Xiaomi Redmi 9C have enough power to perform most everyday tasks, but over time, users begin to notice a decrease in the speed of the interface. Often the cause of this phenomenon is crowded system memory, which accumulates temporary files known as cache. This data is created by the MIUI operating system and installed applications to speed up the launch of programs, but their excess can lead to conflicts and crashes.
Cache cleaning is a safe and efficient procedure that does not delete your personal photos, contacts or documents. Unlike a full reset, this process only affects temporary files, freeing up valuable space in the internal drive. Regular maintenance allows you to extend the life of the device and ensure stable operation even on budget models with limited RAM.
In this article, we’ll take a look at all the available methods for cleaning temporary files on Redmi 9C, from built-in tools to advanced developer menu features. You’ll learn how to use a standard cleaner, how to manage the cache of individual applications, and when to resort to more radical measures.
Why the cache is piling up and how it affects the Redmi 9C
The principle of data caching is to save frequently used information for quick access. When you launch YouTube, Instagram or a browser, the system saves interface elements and media files so that when you re-enter, you do not download them again from the network, which significantly saves traffic and speeds up the response of applications, which is critical for the MediaTek Helio G35 processor installed in this model.
But there's a downside to this: over time, the cache can reach several gigabytes. On devices with 32 or 64 GB of internal memory, which is typical of basic versions of the Redmi 9C, this becomes a tangible problem. The system starts to work slower, as it has to index huge amounts of temporary data, and the space to write new information runs out.
In addition, corrupted or outdated cached files can cause errors in the operation of programs. You may encounter a situation where the application crashes immediately after launch or freezes at a certain stage. In such cases, cleaning the cache is the first step of diagnosis, which often solves the problem without the need to reinstall the software.
⚠️ Warning: Don’t confuse cache cleaning with app data deletion. If you choose Clear All or Reset, the program will return to factory settings, and you will lose logins, progress saves, and personal settings inside it.
Understanding the difference between system cache and user data is key to maintaining a smartphone, and the cache can be removed safely, while the data must be treated with caution, and in the following sections we will show you how to perform these operations as safely as possible.
Use of the built-in "Security" application
The easiest and recommended way for the manufacturer to clean up temporary files is by using a pre-installed system tool, which is called Security in the MIUI shell and has a green icon with a shield, which automatically scans the device for junk files, remnants of deleted applications and excess cache.
To get started, open the app and wait until the automatic scan is completed. It usually takes no more than 10-15 seconds. Once the system has analyzed the memory status, you will see a Clean up button indicating the amount of files that can be deleted without harming the device.
☑️ Checking before cleaning
It is important to note that a standard cleaner does not always remove the cache of heavy applications completely, leaving some files to speed up the launch.If your goal is to free up maximum space, you will need to manually clean through the settings discussed below.
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Run a deep cleanup in the Security app after you upgrade your system – this will remove old installation files that are no longer needed.
Manually cleaning the cache of individual applications
If a particular program is unstable or takes up too much space, it is best to clear its cache individually, allowing you to point-to-point memory management without affecting data from other services. On Xiaomi Redmi 9C, this process is performed through the settings menu, where you can control each application installed in detail.
To get to the menu, go to Settings → Apps → All apps. In the list that opens, find a problem program, such as Telegram or Google Chrome, and click on it. In the app information window that opens, you will see the Memory button or the amount of space you occupy.
Click on Clear and select Clear Cache, and the system will warn you that temporary files will be deleted. Confirm the action. After this procedure, the application will run a little longer than usual, as it will have to recreate the necessary temporary files, but the errors in its work should disappear.
| Annex | Type of data in the cache | Is it safe to remove | Impact on data |
|---|---|---|---|
| Google Chrome | Website images, scripts | Yes. | No exit from accounts will occur |
| Photo and video from the tape | Yes. | We'll have to reload the tape. | |
| YouTube | Miniatures, video buffer | Yes. | Viewing history will continue |
| Google Maps | Map fragments | Yes. | Offline maps may require an update |
This approach is especially useful for social networks and instant messengers, which tend to accumulate gigabytes of media files, and regular checking of the most “heavy” applications helps to maintain free disk space within reasonable limits.
Cleaning through storage menu and analysis
Newer versions of the Android 10/11 MIUI shell offer advanced storage analysis. This tool allows you to visually assess what exactly is taking up space on your Redmi 9C. Go to Settings → About Phone → Storage to see a detailed memory distribution diagram.
Here, you can categorize files by type: apps, images, videos, documents, etc. By clicking on the Apps category, you can sort them by memory size, which can help identify hidden sources of debris that are not visible in normal use, and it often turns out that a long-forgotten game or service takes up several gigabytes.
⚠️ Warning: Be careful when deleting data from Google system applications.Cache cleaning is safe, but deleting data can disrupt sync and other services.
Use the "Clear Recommendations" feature if available in your area. MIUI's AI analyzes your usage habits and can suggest removing old screenshots, duplicate photos or cache of apps you haven't used in more than a month. This is a great way to automate the maintenance process.
What to do if the “Clear Cache” button is inactive?
Using Developer Mode for Advanced Cleaning
For power users who want to gain maximum control over the system, the developer mode is available. Activating this mode opens access to hidden menus where you can manage processes in more detail. → About the phone and press 7 times in a row on the item "Version" MIUI».
Once you have a "You've become a developer" message, go back to the main settings menu and find the "Additional" or "Extended Settings" section. Select "Developers" option. Here we're interested in the option related to background processes or application limit, but there's no direct cache clearing here. However, here you can limit background activity, which will indirectly reduce cache growth.
A more effective method in this section is to reset network settings or force services to stop, but this requires caution. The main benefit of the developer mode for cleaning is the ability to see active services and stop those that are growing uncontrollably.
- 📱 Stopping Services: allows you to forcibly terminate the process, after which its cache can be safely deleted through the application menu.
- 🔄 Background Process Limit: Setting a Limit on the Number of Working Applications in the Background Reduces the RAM Load.
- 🗑️ Do not delete activity: make sure this option is turned off, otherwise the system will keep all windows state, clogging memory.
Using these tools requires understanding what each process is responsible for. Unwise shutdown of system services can lead to unstable phone operation, so change the settings only if you are confident in your actions.
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Developer mode is a powerful tool, but standard cache cleaning is enough. Use it only if you know what you're doing.
Cleaning the cache in Recovery mode (for advanced)
There's another, deeper level of cleaning, through the Recovery Mode, which is a method that allows you to clear the system cache that's not available through the normal interface, which is useful if the phone is extremely slow, glitchy or not loading correctly, and on the Redmi 9C, it's a keyboard that enters this mode.
Turn off the smartphone 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 button, but keep the volume up until the Recovery menu appears. Navigation is done with the volume buttons, and selection is done with the power button.
Wipe Data → Wipe Cache (if available) → ConfirmIt is important to distinguish between the options of Wipe Cache and Wipe All Data. The first deletes only temporary system files, the second completely erases the phone, returning it to a factory state. On many modern devices with data encryption, the option of separate cache cleaning in Recovery may not be available or hidden.
⚠️ Warning: Entering Recovery mode and performing operations there carries risks. If you are not sure about your actions, it is better to limit yourself to software cleaning through settings. Wrong actions can lead to data loss or the need to flash it.
If you don't see an explicit "Wipe Cache" button after you log in to Recovery, you shouldn't choose "Wipe Data" unless you're planning a full reset. In such cases, it's best to go back to the system and use the standard methods described above.