Many users are faced with the problem of insufficient RAM on their smartphones, especially on devices in the mid-range and budget segment. When several heavy applications are running, the system begins to aggressively terminate background processes, which leads to constant app reboots and data loss. Standard methods of clearing the cache or closing applications provide only a temporary effect, without solving the root problem of hardware limitations.
Availability root access opens access to deep settings of the Linux kernel on which Android is based, allowing you to artificially expand the available amount of RAM. This is achieved by creating virtual memory based on internal flash memory or using specialized data compression algorithms. However, interfering with the work of the memory manager requires caution, since an incorrect configuration can lead to reduced drive speed or system instability.
In this article we will analyze in detail the technical methods of increasing RAM, consider the difference between SWAP and ZRAM, and also evaluate the feasibility of such manipulations for various scenarios for using the device. You will learn which tools are the most secure and how to minimize memory wear when activating expansion functions.
Principles of virtual memory on Android
The Android operating system uses the Linux architecture, where memory is managed through the paging mechanism. In the classic sense, when the physical RAM is full, the least used data pages are moved to a special area on the disk, freeing up space for active tasks. On desktop systems this is called a page file, but in a mobile environment the approach is different due to the nature of data storage.
The main limitation of mobile devices is the read and write speed of the built-in storage. Even modern standards UFS 3.1 or UFS 4.0 are significantly inferior in speed to RAM type LPDDR5. Therefore, creating a large swap file can cause the system to begin to “slow down” when accessing uploaded data, creating the illusion of freezing.
However, for devices with a small amount of memory (2-4 GB), using virtual memory is often the only way to keep messengers and social networks in the background. The key parameter here is the balance between the amount of allocated space and the system response speed when swapping pages.
ZRAM technology: compression instead of unloading
One of the most effective optimization methods is the use of technology ZRAM. Unlike a classic swap, ZRAM does not write data to a physical disk, but creates a compressed block in the RAM itself. This allows you to store more data in the same physical volume, sacrificing only a small amount of CPU time for compression and decompression.
Modern mobile device processors are powerful enough to perform LZ4 or ZSTD compression operations almost instantly. To the user, this appears as a smooth increase in available memory without noticeable delays. Activating ZRAM is especially useful on devices with fast RAM, but a slow drive.
Adjusting the size of a ZRAM disk is usually done through system properties or specialized modules. The optimal value is considered to be 50% or 100% of the physical memory, although some enthusiasts increase it to 200%. Exceeding reasonable limits can result in excessive load on the CPU.
Use the LZ4 compression algorithm for ZRAM, as it provides the best balance between speed and compression ratio on mobile processors.
⚠️ Attention: Excessively increasing the size of ZRAM can cause the system to spend more CPU resources on data compression than it saves on RAM memory, which will cause a general drop in performance in games.
Creating a swap file (SWAP) on the internal drive
If compression technology is not enough, you can resort to creating a full-fledged swap file on the internal storage. This method requires root access and a file system that supports the required attributes. The file is created as a regular image of the required size, which is then mounted as a swap partition.
The setup process usually involves the use of a terminal or specialized applications like SWAP No Root (for some versions) or Kernel Adiutor. The user must specify the path to the file, its size and priority of use. The system will begin to use this file when physical memory is exhausted.
It is important to understand that constantly writing data to the page file increases wear on the flash memory cells. For modern drives with a high write resource, this is not a critical problem with moderate use, but on older devices with memory eMMC the risk of drive failure increases.
☑️ Preparing to create a SWAP file
It is recommended not to allocate more than 2-4 GB for swap, even if there is free space on the disk place. Large volumes will not give an increase in speed, since the limiting factor will be the bandwidth of the memory controller, and not the amount of available space.
Adjusting LMK (Low Memory Killer) parameters
In addition to expanding the memory capacity, a critical aspect is adjusting the algorithm Low Memory Killer (LMK). This mechanism decides which processes should be terminated when there is a lack of resources. Standard Android settings are often too aggressive, closing applications immediately after minimizing.
Using root access, you can edit configuration files in the directory /sys/module/lowmemorykiller/parameters/. By changing the memory threshold values for different categories of processes (foreground, visible, perceptible, background), you can force the system to keep applications in the background longer.
echo "0,2048,4096,8192,12288,16384" > /sys/module/lowmemorykiller/parameters/minfreeThis command sets the process killer thresholds in kilobytes. Finding the optimal values requires experimentation, as they depend on the total amount of RAM and user habits. Too soft settings can lead to the system itself starting to slow down due to memory overflow.
Use of specialized modules and applications
To simplify the setup process, there are ready-made solutions in the form of modules for Magisk or applications with a graphical interface. Modules like Universal GMS Doze or specialized memory optimization scripts allow you to automate the process without manually entering commands in the terminal.
Applications like KLWP (with root access) or Kernel Manager provide convenient sliders for changing ZRAM parameters and the minimum free amount of memory. They also allow you to save settings profiles that can be quickly switched depending on current tasks.
When choosing a module, you should pay attention to the date of the last update and compatibility with the Android version. Outdated scripts may conflict with the new memory management mechanisms introduced in Android 12, 13 and 14, causing cyclic reboots.
| Method | Impact on speed | Memory wear | Complexity settings |
|---|---|---|---|
| ZRAM | High (compression in RAM) | None | Low |
| SWAP file | Low (depending on the disk) | High | Medium |
| LMK setting | Does not affect speed | None | High |
| Ready modules | Depends on the script | Medium | Low |
Risks and potential problems during modification
Interfering with the operation of the memory subsystem carries certain risks. The most common problem is the occurrence of bootloop (cyclic reboot) if the parameters are allocated incorrectly or the module conflicts with the kernel. In this case, the device may stop booting to the main screen.
There is also a risk of accelerated wear of the drive when actively using the SWAP file. Constant recording and rewriting of data blocks reduces the resource of NAND memory cells, which is especially important for budget smartphones with cheap controllers.
How to restore a device after an unsuccessful setup?
If the device gets into a bootloop, you need to boot into Recovery mode (usually holding the volume up + power) and remove the problematic Magisk module or reset the settings via wipe cache/dalvik. As a last resort, you will need to flash the device via Fastboot.
⚠️ Attention: Before making any changes to system files, be sure to create a full backup (NANDroid backup) via custom recovery to be able to rollback in case of failure.
In addition, some banking applications and games with anti-cheat protection may refuse to work on devices with obtained root access or detected system modifications. Using Magisk Hide or Zygisk can help hide the fact of interference, but does not guarantee 100% performance of all services.
Alternative optimization methods without extension
Before resorting to radical measures, it is worth considering less invasive optimization methods. Disabling animations in the developer menu, prohibiting auto-launch of unnecessary applications and using lightweight versions of apps (Lite-versions) can significantly relieve RAM.
Regularly clearing the cache and deleting unused applications also helps keep the system in good shape. Sometimes the problem of low memory is not caused by the amount of RAM, but by the presence of malware or unoptimized system services that consume resources in the background.
For users who are not willing to risk system stability, the best solution is to purchase a device with a large amount of physical memory. Software crutches cannot fully compensate for hardware limitations, especially in heavy tasks like video editing or modern 3D games.
The best result is achieved by a combination of enabling ZRAM (50-75% of RAM) and soft LMK settings, while creating large SWAP files often has the opposite effect on older devices.
Frequently asked questions (FAQ)
Is it safe to increase RAM on a new smartphone under warranty?
Getting root access and unlocking the bootloader required for such changes will automatically void the manufacturer's warranty in most cases. In addition, on new devices with 8+ GB of memory, such manipulations usually do not make sense and can even reduce performance.
Will a SWAP file increase FPS in games?
No, in games, using a SWAP file will most likely reduce FPS and increase the number of micro-freezes due to the low speed of reading data from the drive compared to real RAM. Games require high bandwidth, which virtual memory cannot provide.
Is it possible to use a microSD memory card to create a swap file?
Technically it is possible, but it is highly not recommended. Memory cards have very low random read/write speed (IOPS), which will cause severe system lag. In addition, this will speed up the failure of the card.
How to check if ZRAM or SWAP is working?
You can use the terminal and enter the command free -m or cat /proc/meminfo. The output will contain the line Swap, which indicates the total amount of available virtual memory and the amount that is currently in use.
Are settings reset after a reboot?
Settings made through commands in the terminal without saving to startup scripts are reset after a reboot. Magisk modules and specialized applications usually apply settings automatically every time the system starts.