Modern smartphones like the Xiaomi Redmi 9A have a powerful hardware, but over time, the accumulation of temporary files can significantly slow down the device. Users often notice that the phone begins to “hang”, applications open longer than usual, and free space in memory quickly melts. This is a natural process of operation of the Android operating system and the MIUI shell, which requires periodic intervention.
Cache is a buffer memory that stores data to quickly load commonly used interface elements and content. However, when this buffer overflows or files are corrupted, the system starts to slow down instead of speeding up. Clearing the cache on Redmi 9A is a safe and effective procedure that does not delete your personal photos, contacts or passwords, but returns the device to its former sharpness.
In this article, we’ll take a look at all the cleaning techniques available, from standard system settings to deeper developer tools. You’ll learn how to distinguish system debris from important data and what steps to take if the phone stops responding to commands. Proper memory maintenance extends the life of the gadget and improves the user experience.
What is cache and why to delete it on Redmi 9A
Cache is a set of temporary files that are created by applications and the system itself to optimize speed. For example, when you open a feed on a social network, images and text blocks are stored in cache memory. When you re-enter the application, data is downloaded from the phone's memory, rather than being downloaded from the Internet again, which saves traffic and time.
However, there is a downside to this mechanism: over time, temporary files can reach several gigabytes, taking up precious internal memory space that Redmi 9A often lacks, and old cache files can conflict with new versions of applications, causing errors, program crashes, or incorrect display of interface elements.
Regular cleaning is necessary if you notice the following symptoms:
- 📉 Applications load noticeably longer than usual or freeze during the launch phase.
- 📉 In the notifications constantly appears warning about the lack of free space.
- 📉 The smartphone heats up even in the absence of heavy tasks, as the processor constantly addresses the crowded storage.
It's important to understand the difference between cleaning the cache and resetting the settings. Cache cleaning only removes temporary debris, leaving your personal data intact. Hard Reset completely erases the entire contents of the phone, returning it to factory status. In the context of speeding up, we need the first, safe option.
Basic cleaning through the “Safety” app
The easiest and safest way to delete temporary files on the Xiaomi Redmi 9A is to use the built-in system application. Xiaomi preinstalles the Security utility, which combines the functions of an antivirus and a memory cleaner, which is ideal for regular maintenance of the device.
To start, look for an icon on your desktop called "Security" (green lightning shield). Launch the app and wait for it to automatically scan the system. Usually, the process takes a few seconds, after which the device status and the amount of junk files will appear on the screen.
Click the big Cleanup button in the center of the screen, and the system will prompt you to delete the temporary files you find, the remnants of deleted apps, and the junk you're reading. Confirm the action, and in a moment you'll see a report on how many megabytes have been released, a basic procedure that you recommend doing once a week.
However, standard cleaning does not always affect the cache of heavy applications such as YouTube, Instagram or TikTok. For a deeper cleaning, you need to go to the settings of specific programs, which will be discussed in the next section. Remember that after cleaning the cache, the first opening of applications may take a little longer until they re-form their databases.
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Use the Cleanup widget on your desktop for quick access to the garbage removal feature without running the full app.
Cleaning the cache of individual applications manually
If a particular application is not working properly or takes up too much space, its cache can be forcibly cleared through system settings, a method that is more effective than standard cleaning, since it allows you to work with the data of each program individually.
Go to the Settings menu of your Redmi 9A. Find the Apps section and select All Apps. You will see the full list of installed software. For convenience, you can sort the list by memory size by clicking on the appropriate sort icon.
Select the application you want to clean (e.g. browser or messenger). In the menu that opens, look for the "Clean" button (usually located at the bottom of the screen). When you click, you will see a pop-up with two options: "Clear Cache" and "Clear Everything." Choose "Clean Cache" to avoid losing logins and settings.
Here is a list of apps whose cache is recommended to be checked first:
- 📱 Browsers (Chrome, Mi Browser): accumulate gigabytes of data from visited sites and pictures.
- 📱 Social networks (Telegram, WhatsApp, VK): Store thousands of viewed images and video files in temporary storage.
- 📱 Video hosting (YouTube, TikTok): cache here can take up to 50% of all free space on budget smartphones.
Once the cache is cleared, the app will run as it did for the first time, but all your accounts and correspondence will be saved. If you choose Clear Everything, the program will return to factory settings, and you will have to re-enter passwords.
☑️ Checklist of deep cleaning
Using Developer Mode for Deep Cleaning
For advanced users of Xiaomi Redmi 9A, there is the possibility of accessing hidden system functions through the developer menu, which allows you to clear the cache more aggressively, including the Dalvik cache, which is responsible for the operation of all installed applications at the system level.
To activate the developer mode, go to Settings → About the phone. Find the line "Version." MIUI» And press it fast. 7-10 Once in a row, after a series of clicks, a notification will appear "You became a developer!". Now, in the main settings menu, in the "Additional" section, a new item will appear "For developers».
Inside this menu, scroll down to Debugging. Find the option “Selective Memory Deletion” or “Clear Google Play Services” (names may vary depending on the version of MIUI). You can also find the network reset feature here, which clears the DNS cache and Bluetooth connections, which is useful for Wi-Fi issues.
⚠️ Warning: Do not change the settings in the developer menu unless you are sure of their purpose. Disabling important system processes can lead to unstable interface operation or data loss.
These tools are especially useful after major system updates, when old temporary files may conflict with the new firmware version. If the phone is acting strangely after cleaning through the developer, it is recommended to simply restart the device.
What's Dalvik Cache?
Cleaning DNS cache and network settings
Often, problems with page loading speeds or Wi-Fi connectivity are not due to overcrowded memory, but to an outdated network cache. On Redmi 9A, you can reset network settings, which is equivalent to clearing the connection cache without affecting personal files.
To do this, go to Settings → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth. Click Reset button at the bottom of the screen. The system will request confirmation of action and a password to unlock the screen.
Once this is done, the phone will reboot the network modules, re-enter the Wi-Fi passwords and re-interface Bluetooth devices (headphones, watches), but this often solves problems when the Internet “seems to be there, but nothing loads.”
Additionally, you can manually clear the DNS cache through a hidden menu if a standard reset doesn’t help:
- Open the phone application (call).
- Dial the code ##4636##.
- In the menu that opens, select “Wi-Fi Information”.
- Find the option “Wi-Fi API” and select “Flush DNS” (Clear DNS).
This procedure updates the domain name matching table and IP-Addresses by eliminating routing errors accumulated during use.
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Resetting network settings does not delete photos or contacts, but requires re-entering passwords from Wi-Fi.
Comparison of cleaning methods and efficiency table
There are many ways to free up space on the Xiaomi Redmi 9A, but not all of them are equally effective in different situations. Understanding the differences between methods will help you choose the right tool to solve a specific problem, whether it is a lack of space or errors in the application.
Below is a comparative table of the main cleaning methods, their impact on the system and the security levels for user data.
| Cleaning method | What's removed | Impact on data | Recommended frequency |
|---|---|---|---|
| Security annex | Temporary files, advertising garbage | Secure, data is stored | Once a week. |
| Cleaning the app cache | Temporary files of a specific program | Secure, logins are saved | As necessary |
| Resetting network settings | Wi-Fi passwords, Bluetooth settings, DNS | Reconfiguration of the network is required | When it comes to Internet problems |
| Cleaning "Everything" (Data) | Cash + Logins + Application settings | Complete reset of the application to zero | Critical errors |
As you can see from the table, the safest and most versatile method is to use a built-in cleaner. Deeper methods should be applied point-by-point when specific problems arise. Do not abuse the complete reset of these applications unnecessarily, as this disrupts the usual workflow of working with a smartphone.
Also worth mentioning are third-party utilities like CCleaner or Files by Google. These can be useful, but MIUI often duplicates the system's functions while consuming additional battery life. The built-in Redmi 9A is usually enough for a comfortable operation.