Xiaomi Redmi 9T series smartphones have proven to be reliable devices with excellent autonomy, but even the most powerful hardware stuffing over time becomes digital garbage. The accumulation of temporary files, residual data from remote programs and system logs inevitably leads to a slowdown in the interface and a lack of free space. Owners often notice that the phone begins to “slow down” when switching between tasks or opens familiar applications for a long time.
Cache cleaning is not just a way to free up a couple of gigabytes, but a necessary maintenance procedure for the Android operating system. Unlike a full factory reset, deleting temporary files does not affect your personal photos, contacts or installed games. It is a safe manipulation that helps the system to “breath in” and re-optimize data storage processes.
In this guide, we will take a look at all the cleaning techniques available, from standard MIUI shell tools to advanced developer menu features. You will learn how cleaning a particular application differs from cleaning the system completely, and when to resort to radical measures. Proper memory maintenance will extend the life of your Redmi 9T and keep it fast.
The concept of cache in the Android and MIUI system
Cache is a buffer memory area where temporary files are stored to quickly load frequently used functions. When you open an application, such as a social network or browser, the system stores some data (images, scripts, logins) in the cache, which allows you to re-start not to download information from the Internet, but to read it from the disk, which greatly speeds up the device.
But there's a downside to this coin: over time, the cache can grow to gigabytes, taking up precious space in internal memory. Moreover, if the files in the cache are damaged or outdated, it can cause conflicts, leading to program crashes or incorrect display of interface elements, in which cases, cleaning becomes not just a desirable, but a necessary measure to restore stability.
It is important to distinguish between the application cache and the system cache. The former can be safely deleted selectively for each program through settings. The latter is a more complex structure affecting the operation of the MIUI operating system itself. Understanding this difference will help avoid errors when the user accidentally deletes important data instead of temporary debris.
Why doesn't the cache clean itself?
Preparation of the device before the cleaning procedure
Before you start active actions to free up memory, it is recommended to follow several preparatory steps, which will help to avoid accidental loss of important data and ensure the correct completion of all processes. Although cleaning the cache is considered a safe operation, caution is never superfluous when working with the file system of a smartphone.
First of all, make sure that the battery is at least 30-40%, if there is a sudden power outage during the cleaning process (especially when using deep methods), it can damage the file structure, and it is also worth checking for important system updates, since newer versions of the firmware can improve the memory algorithms.
☑️ Redmi Preparation Checklist 9T
It's not about the cache itself, it's about your photos and documents. In rare cases, when you crash during the cleaning of system partitions, you may need to reset completely, and having a backup will save your information from irretrievable loss.
Clearing the cache of individual applications through settings
The most common and safe way to free up space is to clear the cache of specific applications that consume the most resources, most often social networks, messengers and video platforms become the leaders in the amount of accumulated garbage, and this method allows you to target problem areas without affecting the rest of the system.
To perform the operation, go to the Settings menu of your Redmi 9T. Next, select the App item, then All Apps. In the list that opens, find the desired program (for example, YouTube or Telegram), click on it and select the Memory option. Here you will see the Clean button, next to which the amount of temporary data occupied will be indicated.
- 📱 Social media: often accumulating gigabytes of images and videos from news feeds that can be safely removed.
- 🛒 Marketplaces: Product catalogs and search queries take up a lot of space, but are not critical to work.
- 🎮 Games: Temporary shader files and updates can weigh hundreds of megabytes.
It's worth noting that once the cache is cleaned, the app can load a little longer than usual the next time it starts, which is normal, because it takes time for the system to re-form temporary files. Don't be afraid if the phone behaves unusually immediately after the procedure, after a few minutes all the processes stabilize.
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Use size sorting in the app menu to quickly find the programs that take up the most space, saving you time on the heavyweight search.
Use of the built-in "Security" application
The MIUI shell installed on the Xiaomi Redmi 9T has powerful built-in tools to maintain the device. The Security app includes a cleaner functionality that automatically scans the system for junk files, residual cache and advertising, the easiest way for users who do not want to dive into deep settings.
Run the Security app from the home screen or from the Tools folder. On the home screen, you'll see a large green button that says "Clean up" or a broomstick icon. Click on it to run the scan. The system will analyze the memory and suggest that you delete files that it considers safe to delete, usually browser cache, temporary installer files, and advertising junk.
It is important to read carefully what exactly the system suggests to remove. Although MIUI algorithms work fairly accurately, sometimes small files that you would like to save (for example, thumbnails of recent photos) can be included in the list. In the advanced cleaner settings, you can select data categories to check to exclude unnecessary ones.
⚠️ Warning: Do not use third-party "accelerators" apps from the Play Market unnecessarily. MIUI Optimized for Redmi iron 9T It is better than universal analogues that can consume resources themselves.
For a deeper cleaning in the Security app, go to Clean (Tag icon) in the bottom menu, and the categories Cache, Small Files, Big Files, and Applications are available here. Regular use of this tool, at least once a week, will help keep your smartphone’s performance high without manual intervention in each application.
Deep Cleaning through Developer Mode
For advanced users who want to gain maximum control over the system, there is a developer mode. In Redmi 9T, it is hidden by default, but its activation gives access to additional memory and process management functions. This method is especially useful if the standard methods do not give the desired result or the system is not functioning.
To activate Developer Mode, go to Settings → About Phone. Find the MIUI Version string and quickly click on it 7-10 times in a row until the notification “You’ve become a developer” appears. Then a new option will appear in the settings menu Additional → For Developers. Here you can find options to limit background processes and manage cache.
One of the useful features is the ability to completely stop the application before clearing its cache. From the App menu, select the desired program, click Stop, and then proceed to clear the memory, which ensures that no process will block the deletion of temporary files, which often happens with Google system services.
| Function in the Developer Menu | Description of action | Cache impact |
|---|---|---|
| Don't stay active | Destroys activity immediately after the user leaves | Reduces cache accumulation, but increases the load on the processor |
| Limit of background processes | Limits the number of applications running in the background | Prevents the proliferation of background services cache |
| Resetting debugging settings | Returns the debugging parameters to the factory | Can clear the debugging log cache |
Using these settings requires caution, and changing settings like “Do Not Stay Activated” can make your phone uncomfortable, as apps will be constantly rebooting, and use these tools temporarily to address specific memory problems rather than to work constantly.
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Developer mode is a powerful tool, but its settings should be changed only when you understand the consequences, otherwise you can destabilize the system.
Cache Clearing with Recovery Mode (Wipe Cache Partition)
The most radical, but also the most effective, method is to clean the cache partition through the Recovery Mode, which deletes all temporary system files that have accumulated since firmware updates or during long-term use, and unlike previous methods, it does not clear the application memory, but the Dalvik Cache system partition.
To enter recovery mode on Xiaomi Redmi 9T, you need to turn the device off completely. Then press the Volume Up and Power buttons at the same time. Hold them until the Mi logo appears, then release the power button, but continue to keep the volume until the Recovery menu appears. Navigation is done with volume buttons, the choice is the power button.
⚠️ Warning: Be very careful on the Recovery menu. Choose only Wipe Cache. Do not choose Wipe Data or Factory Reset unless you want to completely delete all your personal data and reset your phone to factory status.
Find Wipe Cache and confirm the action. The process will take a few seconds or minutes, depending on the amount of garbage accumulated. Once completed, select Reboot. The first system start after this procedure can take longer than usual (up to 5-10 minutes), as Android will reassemble the optimized files again.
This method is especially recommended after major operating system updates. New firmware versions often conflict with old temporary files, causing errors and heating of the device. Regular (every 3-6 months) cleaning through Recovery helps keep the Redmi 9T in perfect condition.