Modern Xiaomi and Redmi smartphones often have a significant amount of RAM, but with the release of new versions of MIUI and HyperOS, users have noticed the emergence of a new feature called “Memory Extension.” Many device owners, seeing in the settings the ability to add a few gigabytes to the existing 8 or 12 GB, wonder what kind of technology is this and whether it can really speed up the gadget. In fact, it is a software algorithm that borrows part of the built-in storage for use as virtual RAM.
The technology is not unique to the Chinese giant, as similar mechanisms have long existed in desktop operating systems called the swap file. In the context of Android-based mobile devices, the essence remains the same: the system transfers rarely used background processes from fast but limited RAM to slower but bulkier internal memory. Virtualization allows you to keep more applications open, but has its own technical features that you need to know before activating.
In this article, we will examine in detail how this feature works, analyze whether it gives real performance gains in games and everyday tasks, and find out why it is better to keep it off on some models. Understanding these nuances will help you make an informed decision and customize your Xiaomi or Redmi for the most comfortable operation without putting too much stress on the hardware.
The principle of virtual RAM in Android
To understand the process, you need to look at the architecture of mobile processors. RAM (RAM) has an extremely high speed of reading and writing data, which is critical for instantaneously launching applications and switching between them. Built-in memory (ROM), even modern UFS 3.1 or UFS 4.0, is significantly inferior in speed. When you turn on the expansion function, the operating system creates a special partition or file, which it begins to perceive as an extension of RAM.
The algorithm works like this: when physical RAM becomes insufficient for all running tasks, the system identifies applications that are in the background and have not been used for a long time. This data is moved (wap-in) to the built-in drive. The freed up space in the fast memory is designed for active processes, such as a game or a navigator. This prevents the forced closure of background applications and allows you to return to them faster, albeit with a slight delay when you first download from the paging file.
Importantly, this process is completely transparent to the user and does not require manual control of specific applications. However, the efficiency depends on the type of drive installed. On older models with eMMC 5.1 memory, this feature can even slow down the interface due to low write speed, whereas on flagships with UFS 4.0, the difference will be almost invisible.
⚠️ Warning: Constantly writing and overwriting data in virtual memory mode increases wear on storage cells. On devices with a short lifespan, this can theoretically reduce the lifespan of storage, although modern memory controllers are good at load distribution.
Technical details of implementation
Available volumes and device compatibility
Memory expansion is not available on all smartphones of the brand. As a rule, it is implemented in models of the mid- and high-price segment, released after 2021, running the shells MIUI 12.5 Enhanced Edition, MIUI 13, 14 and the latest HyperOS. Budget devices of the Redmi Note series older generations or models with a RAM of less than 4 GB often do not have this option, since adding virtual memory on a weak hardware will not give a tangible result.
The amount of memory you add depends on the original configuration of the smartphone. The system offers several options to choose from, usually fixed values. For example, if you have a device with 8 GB of physical RAM, you can add another 2, 3 or 4 GB. On top models with 12 GB on board, the available options can reach 6 or even 8 GB of additional space.
Consider that the amount of virtual memory that the manufacturer claims is the maximum possible value, and in reality, the system decides how many megabytes to use at the moment, if you play a heavy game, the system uses the maximum, and when reading an e-book, it may not use the added gigabytes at all, saving resources.
- 📱 Redmi Note 12/13 Pro: Up to support +4 GB +6 GB depending on the regional version of the firmware.
- 📱 Xiaomi 13/14 Series: flagship models often allow you to expand memory 4-8 GB.
- 📱 POCO F5/F6: Gaming smartphones usually have the most flexible extension settings.
How to turn on or off memory expansion
Activation of the function takes only a few seconds and does not require root rights or a connection to the computer. All settings are in the standard system settings menu. However, the location of the item may vary slightly depending on the version of the MIUI shell or HyperOS, and the region for which the smartphone is intended (Global, China, EEA).
To access the settings, follow the following steps: First, open the Settings app and scroll to the About Phone section. Here, find Memory Extension. If there is no item in this section, follow the Settings → Additional Settings → Expansion of Memory. In some versions of the firmware, the icon may simply be called Memory.
In the menu that opens, you will see the current status of the function and the available volume options. Choose the desired value from the list offered. Once selected, the system will warn you to reboot the device to apply the changes. Confirm the action, and after switching on the smartphone, the new memory configuration will take effect.
☑️ Pre-insertion check
If you want to return everything as it was, the process is similar: select the option “No” or “Off” in the same menu and reboot the phone again.
Impact on Performance: Myths and Reality
There is a common misconception that increasing RAM volume magically turns a budget smartphone into a flagship. The reality is that expanding memory helps in multitasking, but does not increase CPU clock speed or GPU speed. If your phone is slowing down because of a weak CPU, adding virtual RAM will not fix the situation, and in some cases may even worsen the responsiveness of the interface.
The main benefit of enabling the feature is visible in scenarios where you are actively using multiple applications at the same time. For example, you play a game, then folded it, responded to a message in the messenger, checked your email and returned to the game. Without the expansion of memory, the game could restart from the start screen (cold start), and with the feature enabled it will remain hanging in the background and start instantly (hot start).
Benchmarks like AnTuTu or Geekbench may have minimal or no scoring gains, as tests primarily measure the net speed of the CPU and the GPU. However, multitasking tests (such as how many Chrome tabs remain open) will perform significantly better.
blockquote>⚠️ Note: On devices with less than 6GB of physical RAM, activation of the expansion can lead to micro-freezes of the interface when folding heavy applications, since the data exchange rate with the drive is lower than the native speed of operation RAM.
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If you use your phone primarily for calls, social media, and video, rather than heavy gaming, try turning off memory expansion, which can make the interface smoother and more predictable.
Comparison of real and virtual memory
To clear up the doubts, let’s compare the physical and virtual memory characteristics in a table, which will help us understand why 4GB of “real” memory is often better than 8GB of “hybrid” memory.
Physical memory like LPDDR5, which is installed in modern smartphones, provides data transfer speeds of up to 6400 Mbps and higher, while even the fast UFS 3.1 drive used for virtual expansion has limitations of sequential reading and, more importantly, random access, which is critical for operating system operation.
| Characteristics | Physical RAM (LPDDR5) | Virtual RAM (from ROM) |
|---|---|---|
| Reading speed | Very high (up to 50+ GB/s) | Medium (depending on UFS, up to 2-3 GB / s) |
| Delays (Latency) | Minimum | Tall. |
| Energy consumption | Low to simple | Above on active recording |
| Depreciation of the device | It doesn't. | Increases the wear and tear of the drive |
The table shows that virtual memory cannot replace physical memory, it serves only as an emergency buffer, and the system optimization in MIUI/HyperOS aims to use this buffer only when the main RAM pool is more than 85-90% full.
Should I use the extension on older models?
Device owners who are several years old are often looking for ways to breathe a second life into their gadgets. Turning on memory expansion on older Xiaomi models is a double-edged sword. On the one hand, it allows you to run heavier versions of apps that require more resources. On the other hand, if the phone's physical drive is already worn out or is of the type of eMMC, its speed will be a bottleneck.
On devices with 3 or 4 GB of physical memory, adding even 2 GB of virtual memory can have a tangible effect in terms of the number of applications open. You will stop seeing constant reboots of Yandex.Navigator or maps when switching from YouTube. However, if the phone started to work slower after turning on the feature, it should be turned off immediately.
Also consider the free space. For the expansion function to work properly, you need to always have a certain amount of space on the internal drive (usually at least 5-10 GB). If your phone is full of photos and videos, the system will not be able to use the paging technology effectively, which will lead to errors and instability.
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On older smartphones with a small amount of RAM (3-4 GB), memory expansion is a necessity for comfortable operation of modern applications, but on powerful devices (8-12 GB), the difference is almost imperceptible.