Every Xiaomi, Redmi, or Poco smartphone owner is confronted with a memory shortage message. MIUI or the new HyperOS insists on "cleaning" the device, and often the first item on the list to be removed is the "cache" category. Many users perceive this as garbage that needs to be destroyed immediately to speed up the gadget. However, blindly deleting all data indiscriminately can lead to the opposite effect: apps will start to load longer, and the battery will die faster.
In this article, we will take a closer look at what cached data is, why it accumulates, and what role it plays in the Android operating system, understand the difference between system cache, application data, and temporary files, and learn how to manage your device’s memory wisely without resorting to radical measures like factory resets.
The nature of caching in the Android operating system
Cache is a temporary storage area that is designed to speed up access to frequently used information. When you first launch a heavy app like VK or Telegram, it downloads contact avatars, channel previews and interface elements. Instead of downloading those images again each time using mobile traffic and CPU time, the system stores copies of them in cache. The next time you log in, the app reads data from the phone's fast memory, which makes the interface work instantly.
The caching mechanism works at the level of the Android kernel and the MIUI shell. The operating system decides which files are important for performance and which can be deleted if space is not enough. However, over time, this “fast memory” can grow to gigabytes, which is because application developers often do not prescribe strict limits on the size of the cache, allowing it to occupy all available space.
It's important to understand that cache is not a virus or a bug. It's normal for optimization algorithms to work. Problems begin when the cache becomes "bit" (contains errors in the data) or takes up a critical amount of internal memory, leaving no room for new photos or system updates, in which case user intervention is necessary.
⚠️ Warning: Do not try to delete system cache files through root-right file managers if you do not understand the purpose of each folder.This can lead to a cyclical restart of the phone or the disappearance of system fonts and icons.
There are several levels of caching. The first level is the cache of a particular application (for example, the search history in the browser); the second level is the system cache, which contains temporary files of the Xiaomi shell itself.Dalvik/ART, It stores optimized application code to run applications quickly, and understanding this hierarchy helps you choose the right cleaning method.
Types of cache: system, applications and Dalvik
For proper memory management, you need to distinguish between types of temporary files. Xiaomi smartphones can distinguish three main categories, each of which has its own features of storage and cleaning.
- 📱 App Cache: The most common type, which includes temporary files from social networks, instant messengers, games and browsers, and it is the most common type of cache, especially after watching high-resolution videos.
- ⚙️ System Cache: Files required for the interface to work MIUI, It usually takes up less space, but damage to it can cause a malfunction of the menu or "phone book».
- 🚀 Cash. Dalvik/ART: Specialized memory area where optimized versions are stored APK-This allows you to run programs quickly. When you update your system or firmware, this cache is automatically recreated.
The most interesting thing for the average user is the app cache, and it's the growth that often causes the message "Memory is full." Xiaomi's standard tools make it easy to manage this category. You just go to the settings, find the Apps section, and select a specific program, and there's a "Clear Cache" button that's safe for your personal data.
The Dalvik cache is more complicated. You can't clean it with the usual settings menu, it requires you to enter Recovery mode or use superuser rights. However, in modern versions of Android (starting with version 10), the need for manual cleaning of Dalvik cache has almost disappeared, as the system has learned to manage this area effectively.
Why is the cache growing so fast?
The impact of crowded cache on the work of the smartphone
When the volume of cached data becomes too large, it begins to negatively affect the performance of the device. Internal memory such as UFS or eMMC used in Xiaomi, runs slower if it is filled by more than 85-90%.
In addition, the sprawling cache may contain conflicting files, for example, after an application update, the old graphic elements in the cache may not match the new code of the program, which leads to application crashes, incorrect display of the interface or endless download, in which case cleaning the cache is the only way to fix the situation without reinstalling the program.
Another important aspect is power consumption: the process of constantly searching for free space and trying to write new data into a crowded cache makes the memory controller work with increased load, which leads to faster battery discharge and heat of the smartphone case, which is especially noticeable in the budget models of the Redmi Note series.
| Symptoms. | The probable cause is in the cache | Recommended action |
|---|---|---|
| The application closes immediately after opening. | Damaged temporary files | Clear the cache of a particular application |
| The phone is slow, the interface is lagging | Over 90% of memory is filled | Delete unnecessary files and cache of all applications |
| There is no update to the system | Not enough space for the update package | Clear the bootloader cache and system cache |
| The battery is discharged faster than usual | Background caching processes | Restart the device or clear the system cache |
It's worth noting that not all slowdowns are cache-related, and if the problem persists after cleaning, it may be hardware or deeper firmware errors, but cleaning the cache is always the first and safest step in diagnosis.
How to Clear the Cache of Applications on Xiaomi
The MIUI and HyperOS shells provide convenient built-in memory management tools, and the easiest way is to use the standard Security app, which automatically scans the device and suggests removing the “junk” that is often referred to as cached data.
But for more point-based work, you'd better use manual control through settings, which allows you to free up space selectively without deleting the cache of the apps you're using right now.
- 📂 Open Settings and go to the Application section → All applications.
- 🔍 Find a “heavy” app (like Instagram, TikTok, or YouTube) in the list).
- 🗑️ Click on the Warehouse item and select the Clean button. → Clear the cache.
It is important not to confuse the "Clear Cache" and "Clear Everything" buttons (or "Reset"). The second button will delete all your logins, passwords, correspondence and settings within the application. Delete the cache safely, your data will remain in place, but the next time the application starts, it can load a little longer than usual.
For mass cleaning, you can use the Memory feature in the settings, the system will show the occupancy schedule and suggest clearing files, and the Security app has a Cleanup tool that finds the cache of popular applications at a single click, which is a quick way, but it is less accurate than manual sampling.
☑️ Proper cleaning of the cache
Cleaning the system cache through Recovery Mode
If the phone is unstable, freezes or doesn’t boot after an upgrade, it may be necessary to clean the system cache through Recovery Mode.This method doesn’t delete personal files (photos, contacts), but resets temporary system files. On Xiaomi smartphones, this is done through the Recovery menu.
To enter this mode, you need to turn off the smartphone completely. Then press the combination of buttons: usually it is Volume Up + Turn button. You need to hold them until the Mi logo or Recovery menu appears. The interface can be controlled by touching the screen or volume buttons (depending on the version of Recovery).
You can find Wipe Data on the Recovery menu, and be very careful: newer versions of MIUI often erase all data immediately. If you have a Wipe Cache Partition option, choose it. If you don't have one, only "Wipe All Data," you'd better refrain from doing it if you're not ready for a full reset.
⚠️ Attention: On modern Xiaomi smartphones with a locked bootloader and the current version MIUI/HyperOS A separate "Wipe Cache" button is often missing. Trying to clear the cache through "Wipe All Data" will result in the complete removal of all your photos and apps!
If you still find a safe way to clear the system cache or use custom Recovery (such as TWRP), after the procedure, you need to select Reboot. The first start of the system may take longer than usual - this is normal, since the system recreates the necessary temporary files.
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Before any manipulations in Recovery mode, be sure to back up your important data to the Mi Cloud or your computer. This will take a few minutes, but will save your data in case of an error.
Automation and Myths about Cache Cleaning
There are many myths surrounding the cache, and the main one is that, "Cache needs to be cleaned every day for maximum speed," which is a dangerous misconception. Constantly cleaning the cache causes the processor and modem to work harder, rebooting data, which ultimately reduces autonomy and increases memory wear.
Modern versions of Android and MIUI have built-in self-regulation mechanisms: When the system needs space, it automatically deletes old, unused cached files. Third-party “cleaner” applications (Clean Master and analogues) often do more harm than good, obsessively working in the background and wasting resources.
The only time that frequent cleaning is warranted is when the application is at the device’s memory limit (e.g., 32GB or 64GB), in which case you can set up automatic cleaning via the built-in Security app.
- 🤖 Go to the Security app.
- ⚙️ Click on the gear settings in the corner.
- 📅 Select Waste Cleanup and set up automatic start or notification.
Use only Xiaomi’s built-in automation tools. Third-party programs often don’t have deep access to the system due to Android limitations and only clean the visible part of the iceberg, creating visibility of work.
To sum up, cache is a friend, not an enemy, as long as you control its size, and good temp file management will help your Xiaomi run fast and stable over the years.
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Regular cleaning of the cache is only necessary if there is a lack of space or failures in applications. In normal mode, entrust memory management to the Android system.