Owners of modern Xiaomi smartphones often face the issue of lack of free resources when running heavy applications or multitasking. In recent years, mobile device manufacturers have introduced technology that allows you to use part of the permanent storage as additional RAM, this feature in the shell of MIUI and HyperOS has been called “Memory Extension” or “Memory Extension”.
The technology is about reallocating resources: it takes a certain amount of internal flash memory and creates a virtual partition that works on the principles of a swap file, which allows you to keep more running applications in the background, preventing them from being downloaded from RAM. However, virtual RAM is not a full replacement for physical chips and has its own speed and durability limitations.
In this article, we will take a closer look at how this feature works, evaluate its real-world performance across different smartphone models, and answer the main question: whether to activate this option for everyday use or games. Understanding the mechanics of the process will help you make an informed decision about how to set up your device.
The principle of operation of virtual extension
Memory expansion technology is based on a swap mechanism that has been used for decades in desktop operating systems. When physical RAM is filled with active application data, the system begins to move less-priority data to temporary storage on flash memory, which is automated and hidden from the user in standard operating mode on Xiaomi smartphones.
The Android operating system that underpins MIUI runs this process through the Linux kernel. When there is a shortage of free cells in physical memory, the background applications are written to a special section on the internal drive. When the user needs the application again, the data is read back, and the speed of this process depends on the type of drive used.
It’s important to understand that flash memory is much slower than RAM. If modern flagships use UFS 3.1 or UFS 4.0, which provides high read and write speeds, then budget models with eMMC or UFS 2.1 can experience delays, which is why on older or cheaper devices, enabling this feature can lead to the opposite effect of slowing the interface.
⚠️ Warning: Constantly writing and overwriting data to the same sector of flash memory speeds up its physical wear. Although modern controllers are able to distribute the load, the active use of memory expansion theoretically reduces the life of the drive.
Technical details of the operation of the core
How to enable and configure the feature on Xiaomi
Activation of memory expansion in Xiaomi smartphones is made through the standard settings menu, but the location of the item may vary depending on the version of the MIUI shell or HyperOS. Usually the path is as follows: you need to go to Settings → About the phone and click several times on the version of the processor or find a separate item “Memory Extension”. In some versions of the firmware, this option is put in the section Additional → Memory Expansion.
Once you log in, the system will suggest you to select the amount of virtual memory available, depending on the device model and the amount of free physical memory available, typically 2 to 4 GB of additional space available to the user, and require a complete reboot of the device to implement the changes, since partitioning is done at a low level of the file system.
☑️ Activation algorithm
It is worth noting that some global firmware versions may not have this feature, and in such cases activation is only possible through an engineering menu or root rights, which is not recommended for ordinary users because of the risk of losing warranty. If you do not see the option in the standard menu, it is possible that your model is not certified to work with this technology.
💡
Before you turn on the memory extension, free at least 10-15 GB on the internal drive. The system should have a reserve of free space for the correct operation of the wear alignment and caching algorithms.
Impact on productivity and gaming
The most interesting question for users is the impact of memory expansion on gameplay: In theory, the presence of additional RAM allows games not to be unloaded from memory when switching to other tasks. However, in practice, FPS (frames per second) is extremely rare, since games primarily depend on the power of the processor and graphics accelerator.
The real benefit is in multitasking scenarios, where if you switch between heavy apps, a multi-tab browser and a navigator, expanding memory can help keep them healthy, and without this feature, the system would have to restart applications from scratch, which takes longer and consumes battery life.
However, in resource-intensive games like Genshin Impact or PUBG Mobile, the use of slow virtual memory can lead to micro-freezes (short-term delays) when loading textures or locations. This is because the speed of reading data from flash memory is not sufficient for real-time streaming of assets.
💡
Expanding memory does not add processing power to the processor or increase FPS in games; its main goal is to increase the number of simultaneous applications in the background.
Comparison of memory models and types
The performance of the function depends on the hardware platform of the smartphone. Owners of flagship devices with fast memory UFS 3.1 and higher may not notice the difference in speed, since the delays are minimal.
Consider the dependence of efficiency on the type of storage device and the amount of physical memory:
| Type of device | Type of memory | Physical RAM | The effect of expansion |
|---|---|---|---|
| Budgetary (Redmi A/Note) | eMMC 5.1 / UFS 2.1 | 4GB | Possible lags, accelerated wear |
| Middle class (Redmi Note) | UFS 2.2 | 6-8 GB | Notable improvement in multitasking |
| Subflagship (Poco F/X) | UFS 3.1 | 8-12 GB | Minimum increase, work stable |
| Flagship (Xiaomi 13/14) | UFS 4.0 | 12-16 GB | Needless to say, the system is doing it all by itself. |
As you can see from the table, the most relevant memory expansion for mid-range devices with 6-8 GB of RAM. Owners of smartphones with 12 GB and more physical RAM to include this feature, as a rule, does not make practical sense, since the system rarely comes to the consumption limit.
Impact on the storage resource
One of the most talked-about aspects of using virtual memory is the impact on the life of the drive. Flash memory has a limited resource of overwriting cycles. When using memory expansion actively, the system constantly writes and erases data in the dedicated partition, which in theory can lead to a faster failure of the drive.
Modern memory controllers use wear leveling technology to distribute the recording across the entire disk, which minimizes the risk of damage to a particular sector. However, when you work intensively in 24/7 mode, especially if physical memory is critically small, the load on the controller increases many times over.
For a regular user who does not play heavy games 8 hours a day and does not keep open dozens of applications, the risk of failure of the drive in the coming years 2-3 It's a minimum year, but if you plan to use your phone more 4-5 In the years to come, it is worth considering the feasibility of a constant load on the disk.
⚠️ Warning: If you notice that your smartphone is slowing down when writing files or installing apps, try turning off the memory extension.This may be a sign of the storage device’s degradation or buffer overflowing.
Optimization and alternative methods
Instead of or along with the expansion of memory, other methods of optimizing the system can be used. Cleaning up autoboot, disabling unnecessary animations, and removing rarely used applications often give a more tangible performance gain than virtual RAM.
Also worth noting is the Memory Cleanup feature in Xiaomi’s Security app, which forcibly unloads processes from memory, freeing up resources for the current task. Combined with competent management of background processes through Settings → Apps → Permissions → Autostart, this allows you to keep the system on top.
For advanced users, there is the possibility of fine-tuning the swap parameters through ADB-It requires a lot of knowledge and can lead to unstable system operation. Standard settings offered by the manufacturer are usually sufficient for most use cases.