Modern mobile applications are becoming increasingly demanding on device resources, which often leads to a lack of free RAM. When physical RAM becomes full, the system begins to aggressively terminate background processes, causing application reloads and a slower interface. Owners of smartphones with an average budget are often faced with a situation where 4 or 6 gigabytes of memory is simply not enough for comfortable multitasking.
Fortunately, the Android operating system provides mechanisms for creating virtual memorythat allow you to use part of the permanent storage (flash memory) as a supplement to the operational one. This process, known as RAM expansion or creation SWAP partitioncan significantly extend the life of the device and improve the smoothness of heavy games and apps. However, before you start making changes, you need to understand the difference between the physical speed of memory chips and the emulation that the system offers.
⚠️ Attention: Using virtual memory creates an additional load on the device drive, which can lead to accelerated wear of the flash memory under intensive use recording data.
The principle of operation of virtual memory in Android
The technology is based on the paging mechanism, when data from full RAM is temporarily transferred to a slower but more capacious drive. This function was originally implemented in the Linux kernel as a technology ZRAMthat compresses data in RAM, saving space, but requiring processor resources to decompress. A more classic approach involves creating a special partition or page file SWAP directly on the internal storage.
When you run an application that requires more resources than are physically available, the system moves the least used memory pages to this virtual buffer. This allows you to keep more applications in the background without completely unloading them. It is important to note that the read and write speed of internal memory (UFS or eMMC) is significantly lower than that of LPDDR4 or LPDDR5 chips, so the system response when accessing virtual memory will be slower.
However, for devices with a small amount of RAM, having such a buffer is preferable to constantly reloading applications. Smartphone manufacturers, such as Xiaomi, Samsung and Oppo, have already implemented this feature in their shells under the names Memory Extension or RAM Plus, making the setup process as simple as possible for the average user.
Virtual memory does not increase the physical speed of the processor, it only prevents applications from unloading from the background, improving multitasking.
Built-in memory expansion functions without root access
Many modern mid- and high-price smartphones are equipped with a software memory expansion function, available directly in the system settings. This option is usually hidden in sections related to device maintenance or additional memory settings. Activating this feature does not require superuser rights and is the safest optimization method for beginners.
To find this setting, you will need to go to the menu Settings and search for "RAM" or "Memory". In devices Samsung this function is called RAM Plus and is located in the section Device maintenance → Memory. Here the user can select the amount of virtual expansion, usually varying from 2 to 8 gigabytes depending on the model.
On smartphones Xiaomi with the MIUI or HyperOS shell, a similar option is available name Memory expansion. It is located along the way Settings → Additional settings → Memory expansion. After changing the value, the device will require a mandatory reboot to apply the new kernel parameters. It is worth considering that the available expansion volume directly depends on the amount of free space on the internal drive.
- 📱 Samsung: Settings → Device maintenance → Memory → RAM Plus.
- 📱 Xiaomi / Redmi: Settings → Additional settings → Memory expansion.
- 📱 Oppo / Realme: Settings → About phone → Click 7 times on the build version → RAM expansion.
- 📱 Vivo: Settings → About phone → RAM expansion.
Using third-party applications to create SWAP
If your smartphone does not support the memory expansion function at the firmware level, you can use specialized software from the Google Play store. Applications like SWAP No Root or Memory Swap create a page file in user space, simulating the operation of the system partition. This method works on most devices, but its efficiency is lower than that of system solutions.
The setup process in such applications is usually intuitive: after launch, you need to specify the desired size of the paging file and click the activation button. The application will ask for permission to create a file in the storage and will notify you that the service has started successfully. It is worth remembering that running such apps in the background itself consumes some of the battery and processor resources.
The effectiveness of third-party solutions greatly depends on the type of drive you have. On older devices with memory type eMMC creating a large page file can lead to noticeable interface slowdowns due to low random read and write speeds. In such cases, it is better to limit yourself to the minimum amount of expansion or abandon this idea altogether.
⚠️ Attention: Third-party applications do not have access to the system kernel at a deep level, so their work is less stable and can be interrupted by the power saving system.
Configuring virtual memory through root access and the kernel
For Advanced users with rights Rootare given the opportunity to fine-tune parameters ZRAM and create a full-fledged swap partition. This method requires the installation of specialized kernel managers, such as Kernel Adiutor or Franco Kernel Manager. Through these utilities, you can change compression algorithms and the size of the virtual disk directly.
The first step is to grant the application superuser rights when first launched. Then you should find the section responsible for memory management. Here you will see a slider or input field for changing the size ZRAM. The optimal value is considered to be a volume equal to 50% or 100% of the device’s physical RAM, but not more than 4-6 GB even if there is a large reserve.
You can also select a compression algorithm in the advanced kernel settings. The most common are lzo, lz4 and zstd. The algorithm lz4 is considered the golden mean, providing high speed compression and decompression with minimal processor resources, which is critical for mobile devices. Changing this parameter requires rebooting the device.
An example command for checking the ZRAM status via the terminal:
cat /sys/block/zram0/disksize
☑️ Preparing to modify the kernel
The impact of drive type on performance
The critical factor when setting up virtual memory is the type of internal drive of your smartphone. Modern flagships use standard UFS 3.1 or UFS 4.0, the speed of which approaches the speeds of some SSD drives, which makes the use of a SWAP partition quite expedient and hardly noticeable for the user.
At the same time, budget models are often equipped with memory type eMMC 5.1, which has significantly lower random write speeds. When actively working with virtual memory, such a drive can become a bottleneck, causing interface freezes and long responses to clicks. The table below compares the influence of memory types on SWAP operation.
| Storage type | Read speed (MB/s) | Write speed (MB/s) | SWAP recommendation |
|---|---|---|---|
| UFS 4.0 | ~4200 | ~2800 | Safe, high effect |
| UFS 3.1 | ~2100 | ~1200 | Recommended |
| UFS 2.1 | ~850 | ~250 | With caution |
| eMMC 5.1 | ~300 | ~120 | Not recommended |
If you do not know what type of memory is installed in your device, you can use diagnostic utilities like DevCheck or AIDA64. These applications provide detailed information about the hardware, including drive specifications. Based on this data, it is worth making a decision about activating virtual memory.
How to find the type of memory without apps?
Often information about the type of memory (UFS or eMMC) can be found in reviews of your smartphone model on specialized technical portals or in the official press release of the manufacturer.
Optimization and possible problems after setup
After enabling virtual memory, you need to monitor the behavior of the device for several days. If you notice increased heat in the case or rapid battery drain, this may indicate that the system is using the page file too heavily, constantly writing and reading data. In this case, it is worth reducing the amount of allocated space.
Another common problem is the unstable operation of heavy 3D games. Since textures and assets can be loaded from slow virtual memory, micro-freezes are possible during intense load. For gaming scenarios, it is sometimes more effective to close background applications manually than to rely on automatic paging.
Also keep in mind that when you reset the device to factory settings, all virtual memory settings configured through third-party applications or root managers will be lost. Built-in factory functions, as a rule, are retained or automatically activated upon first startup after a reset, if provided for by the firmware logic.
⚠️ Attention: Settings interfaces and menu item names may differ depending on the Android version and the specific manufacturer's shell. Always check the current guides for your model.
The optimal balance is achieved experimentally: start with the minimum value (2 GB) and increase it only if there is a clear lack of memory.
Frequently asked questions (FAQ)
Will virtual memory increase FPS by games?
No, virtual memory does not directly affect graphics performance or frame rate. It only helps to keep the game in the background without unloading, but does not speed up the processor or video accelerator.
Is it safe to use applications to create SWAP without Root?
Yes, it is safe for the system, since such applications run in user mode. However, they can consume more battery and are less efficient than system solutions.
Does virtual memory shorten the life of a smartphone?
Theoretically, yes, since the number of rewrite cycles of flash memory cells increases. However, for modern UFS drives, this wear and tear within the normal life of the phone (3-5 years) is usually not critical.
Is it possible to use an SD card as virtual memory?
Technically, this is possible through some root applications, but it is highly not recommended. The speed of most microSD cards is too low for RAM tasks, which will cause severe system slowdowns.
Do you need to reboot your phone after changing ZRAM settings?
When changing settings through the built-in system functions, a reboot is required. When using root kernel managers, changes are often applied instantly, but for stability it is recommended to reboot the device.