How to Clean RAM on Xiaomi Redmi Note 9: The Complete Guide

The Redmi Note 9 series has proven to be robust mid-range devices, but over time, even powerful processors can have difficulty multitasking. The main reason for the slowdown of the interface and sudden closure of applications is the overflow of RAM. When free RAM comes to zero, the MIUI system begins to aggressively unload running processes, which leads to long downloads and lags.

Users often think it’s easy enough to close tabs in the browser, but that’s a misconception: Background services, social networks, and instant messengers continue to consume resources even if you’re not using them at the moment. Effective cleaning requires a comprehensive approach that includes both standard system tools and additional settings that not all Xiaomi owners know about.

In this guide, we will look at proven RAM release methods that will help restore speed to your gadget.We will not rely on dubious software-cliner apps from the Play Market, but use the built-in potential of the MIUI shell for deep optimization.

Analysis of current memory status

Before you start doing any active cleaning, you need to understand what your RAM is doing. Unlike internal memory, which stores photos and files, RAM works with data from apps that are running right now. Android is designed to make empty memory count as wasted memory, so it caches frequently used programs to run them quickly.

However, when the amount of cached data exceeds the physical limit of the chip, problems begin. On the Redmi Note 9, with its variations of 4 or 6 GB of RAM, this limit can be reached quite quickly with active use. To see the real picture, you can use the built-in engineering menu or third-party utilities, but most often a standard dispatcher is enough.

⚠️ Warning: Don’t aim to free up 100% of RAM. If the system is constantly forced to reopen basic processes (launcher, Google services), this will lead to increased battery consumption and heat up the processor.

To view detailed statistics, go to Settings → About Phone → All settings and click on MIUI Version several times to activate Developer Mode if it is not already enabled.

It's important to distinguish between free and available memory, and the amount of memory that the system can allocate to new tasks right now, including the amount that's reserved for cache, is what you should be looking at when you're evaluating the need to clean.

Standard cleaning methods through MIUI

The easiest and safest way to quickly free up resources is to use the built-in Security app. This system tool is optimized specifically for Xiaomi hardware and knows how to correctly complete processes without disrupting the stability of the OS. Launch the application and press the large green Speed button.

Once scanned, the system will suggest closing the background applications, but for a deeper cleaning, you should go inside the optimizer menu, and you can see a list of the processes that consume the most RAM, and force them to stop those that you don't need at the moment, which is especially true for heavy applications like marketplaces or navigators.

Another effective method is to use a notification curtain. Swipe from top to bottom to open the control panel, and find the Memory Cleanup icon (usually looks like a broomstick or RAM icon) Pressing it instantly completes background tasks. If there is no such icon, you can add it through the editing menu of the curtain widgets, pulling the curtain all the way down and selecting the appropriate element.

And remember, Extension Memory, which is introduced in the updated MIUI versions for the Redmi Note 9, allows you to reserve some of your internal flash memory for RAM, and while this is not a direct cleaning, it increases the total pool of resources available, allowing the system to more aggressively cache applications.

Managing Autoboot and Background Processes

One of the main reasons for memory devouring is the automatic launch of applications. Many programs prescribe themselves to autoboot to receive notifications or update content instantly. At Xiaomi, this is managed by a special section in the settings, which can be accessed through a search by settings or in the application menu.

Type the word AutoRun in your settings search, and you'll see a list of all programs that have permission to run with the system, and turn off anything that isn't critical (e.g., messengers, alarms, or antiviruses can be left behind, and games and stores can be removed), which will significantly reduce the RAM load immediately after the phone is turned on.

Also worth paying attention to is Background Limitation. From the Apps menu → Settings → Application Management, select heavy program, go to Battery, and select No Restrictions Only for Those Who Have to Work All the Time, or Background Limitation for Others, which will prevent them from working in the background.

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Use Sleep mode for applications in battery settings. This freezes the application when you're not using it, completely freeing RAM, but disabling notifications from it.

Cleaning cache and temporary files

Although the cache primarily takes up internal memory, its proliferation can indirectly affect system performance and RAM. When the system has to process gigabytes of temporary files, this puts additional strain on the memory controller. Regularly cleaning the cache is a good habit for keeping the Redmi Note 9 healthy.

To do this, go to Settings → Storage. The system will analyze the space and suggest clearing the cache. Be careful: do not confuse this with cleaning the application data, as it will delete your logins and game progress. Clearing the cache is safe and only deletes temporary files.

Social networks and instant messengers like Telegram or Viber require special attention. They often store gigabytes of photos and videos viewed in their internal cache. Go to the settings of the application itself (for example, Telegram → Data and Memory → Memory Use) and clear the cache there. This will not only free up space on the disk, but also speed up the application itself, reducing its appetite for RAM.

⚠️ Warning: Don’t use aggressive third-party cliners (Clean Master and analogues) that promise “one-click acceleration.” On modern versions of Android, they often make things worse by constantly restarting system services, which only drains the battery.

Special features and settings of the developer

For advanced users, Xiaomi provides access to hidden settings that allow you to more accurately manage memory. In the menu for developers (how to activate it, described above) there is a limit for background processes. By default, there is a "Standard limit", but you can limit the number of processes, for example, to 3-4 pieces.

This is a radical measure that will cause the system to kill background apps immediately after switching to another task. For a Redmi Note 9 with a small amount of RAM, this can be a salvation if the phone is used only for calls and one or two simple programs.

adb shell dumpsys meminfo

This command, which is entered through a computer with a debugging phone, will show you the most detailed statistics on each process, which may seem complicated to ordinary users, but it gives you the most accurate idea of what exactly is eating away your memory.