Budget smartphone owners often face a shortage of system resources when running heavy apps or games. Xiaomi Redmi 9C, despite its popularity, is equipped with limited RAM, which can cause slowdown of the interface. Modern versions of the MIUI shell offer built-in optimization tools that allow you to partially solve this problem without buying a new device.
There are several methods that will help the system run smoother, from software settings to physical intervention, but it is important to understand that hardware augmentation of RAM in the classical sense for this smartphone is impossible, since memory chips are soldered on the motherboard. All available solutions are aimed at more efficient management of existing gigabytes or creating a virtual buffer.
In this article, we will take a closer look at how to activate the memory expansion feature if it is available in your firmware, and what alternative steps to take to speed up your device, learn about the risks of using third-party programs and how to properly configure the system for comfortable use in 2026-2026.
Redmi 9C technical limitations and myths about RAM
The Redmi 9C is based on the MediaTek Helio G35 processor, which has strict limits on the amount of memory it can address. Depending on the modification, the device comes with 2, 3 or 4 gigabytes of RAM. Users often look for ways to flash memory, but physically replace chips at home is impossible without professional soldering equipment and deep knowledge of electronics.
Many apps in the Play Market promise to “boost RAM” several times over, but they’re actually just clearing the cache or creating a paging file. The swap file is an area on internal flash memory that mimics RAM. The read and write speed of the built-in drive is much lower than that of real RAM, so if you use this method actively, the phone can start to work even slower.
⚠️ Warning: Installing untested apps to overclock memory can lead to virus infection or unstable operation of the Android operating system.
It’s also worth noting that some RAM is always reserved by the system to run the kernel and drivers. Specifications often specify the full size of the chip, but there’s always less available to the user. This is normal for all Android devices, and trying to free up 100% of the resources will lead to constant reboots.
Memory Extension feature built-in in MIUI
Starting with certain versions of the MIUI shell (usually MIUI 12.5 and later, including MIUI 13 and 14), Xiaomi has implemented Memory Extension technology, which allows you to use part of the internal persistent memory (ROM) as an additional RAM (RAM).
To check for availability, you need to go to the settings menu. Navigation may vary slightly depending on the regional version of the firmware (Global, Russia, EEA). Usually the path is as follows: open Settings, then select the About phone section and find the line indicating the amount of memory.
☑️ Memory expansion support check
If an option is found, the system will prompt you to select the amount of memory you add, which is usually available from 1 to 3 GB depending on the available space on the internal drive, and after changing the setting, the device will need to restart to apply the changes and reallocate the resources of the file system.
What happens when you turn on Memory Extension?
It's important to understand that this technology doesn't make a budget phone a flagship, but it's still faster than physical memory, but for social networks and instant messengers, it's enough to keep them from being unloaded from memory when switching between windows.
Set up developer parameters to optimize
If you don't have enough memory extensions or it's not available in your version of the software, you can use the hidden developer menu, and there are tools to fine-tune the behavior of the system, and to get there, you have to click on the build number in the About Phone section several times until you notice the developer mode activation.
In the Developer Menu (often in the Advanced Settings section), we are interested in a few things, first of all, the limitation of background processes. The default is "No Limits", but you can choose "No More than 2 Processes", which will artificially limit the number of applications running, freeing up resources for the active window.
| Parameter | Recommended value | Impact on the system |
|---|---|---|
| Window animation | 0.5x or Disconnected | Visual acceleration of the interface |
| Background processes | No more than 2-3. | Freeing RAM for an Active Application |
| Hardware acceleration | Included (by default) | Using the GPU for rendering |
| Strict regime | Off. | Preventing unnecessary CPU load |
Also worth paying attention to the scale of animations: setting a value of 0.5x or completely turning off animations makes the system work subjectively faster, the interface becomes more responsive, since the system does not need to waste CPU and memory resources to render transitions between screens.
Another important parameter is "Do Not Destroy Activity." If this item is enabled, the system will try to keep the state of the applications at all costs, which on devices with low RAM volume will lead to constant lag. Make sure that this tick is removed so that Android can freely unload unused tasks.
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Periodically clear the cache data in the Apps menu to make room for virtual memory if Memory Extension is active.
Use of swap files through Root rights
For advanced users willing to risk a guarantee, there is a method of creating a full swap file using root access, which requires obtaining superuser rights, for example, through Magisk. Without root rights, creating an effective swap file on modern versions of Android is almost impossible due to security limitations.
The process is as follows: once root rights are obtained, a specialized application is installed, such as SWAP No Root (which works without rights, but less efficiently) or more powerful analogues like Kernel Adiutor. The program creates a large file and forces the system to use it as an extension of RAM. This requires a file system with support for the corresponding access rights.
⚠️ Attention: Getting root rights cancels the warranty on the device and can lead to the breakdown of banking applications due to the SafetyNet protection.
The main disadvantage of this method is the high load on internal memory. Constant writing and reading data in swap mode can quickly wear out the flash memory of a smartphone, especially in the budget segment, which includes the Redmi 9C. If the memory fails, data recovery will be extremely difficult.
Also, using a swap file doesn't always give you performance gains. If the physical memory is full, the system starts to actively dump data onto a slow disk, causing micro-delays (freezes) when switching tasks. On devices with 2 GB of RAM, this can make the phone almost inoperable.
Cleaning the system and removing bloated software
The safest and most effective way to increase the memory available is to free it from unnecessary software debris. Xiaomi smartphones often pre-installed many applications that the user does not use, and removing or disabling such programs releases valuable megabytes.
To remove system applications that cannot be removed by standard means, you can use a computer and an ADB tool (Android Debug Bridge), connecting the phone to a PC in USB debugging mode, you can execute a command to remove packets, for example, to remove heavy services from Google or Xiaomi.
adb shell pm uninstall -k --user 0 com.google.android.videosIt is important to be extremely careful when removing system components.Removing critical services can result in a "bootloop" (cyclic reboot) or inoperability of basic phone functions such as the camera or calls.
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Regularly cleaning the cache and removing unused applications is more effective and safer for Redmi 9C than using virtual memory.
It's also worth checking the autoload of apps. Many programs are pre-written and run in the background, consuming resources. In the battery settings menu, you can limit background activity for specific applications by selecting "No Limits" mode only for the most important messengers, and set strict limits for the rest.
Radical measures: resetting and reflashing
If software methods don't work and the phone is slow, it may be a problem with software errors or accumulated debris over the years. Hard Reset returns the device to factory status. This deletes all user data, photos and contacts, so Backup is a must.
Another option is to install custom firmware (Custom ROM), such as LineageOS or Pixel Experience, which often lacks heavy MIUI shell and many pre-installed services, which significantly reduces the consumption of RAM. On pure Android, the Redmi 9C can run noticeably faster.
But flashing is a complex process that requires unlocking the bootloader. Officially unlocking requires waiting 7 to 168 hours and binding a Mi Account. Mi-doing the wrong thing can turn a smartphone into a brick, a method that only suits advanced users who understand the risks.