Cleaning RAM on Xiaomi Redmi Note 9 Pro: the full guide

Xiaomi Redmi Note 9 Pro is one of the most popular smartphones of the mid-range, but even its 6 GB of RAM eventually begin to “clog” with background processes. If your device began to slow down, applications open for a long time or suddenly close, the problem lies in overloaded RAM. Unlike cleaning cache or internal storage, working with RAM requires a special approach – simple deletion of files will not help here.

In this article, we will discuss 7 proven ways to free RAM on the Redmi Note 9 Pro, from standard MIUI tools to hidden features and third-party utilities. Importantly, the methods are suitable for all model modifications (including the Redmi Note 9 Pro Max and Redmi Note 9S), but the effectiveness depends on the firmware version and installed applications. Some tricks require activation of Developer Mode, but we will talk about this along the way.

Why is RAM clogged on the Redmi Note 9 Pro?

RAM (or RAM) on Android devices works differently than on PCs. The system actively uses free memory to caching commonly used applications — that's normal.

• 📱 Background processes take over >70% RAM (e.g., messengers, social networks, games in anticipation)
• 🔄 MIUI Optimizes memory aggressively, killing the right processes and leaving unnecessary ones behind
• 🦠 Viruses or malicious applications disguised as system services
• 🔧 Mistakes in firmware (especially relevant for customized ROM orbeta MIUI)

The Redmi Note 9 Pro with MIUI 12+ is often bugged: the system does not release RAM after closing heavy applications (such as Genshin Impact or PubG Mobile), even if they are removed from the list of recent ones. This is due to the features of the Qualcomm Snapdragon 720G kernel and the memory management policy in MIUI. In such cases, only forced cleaning helps.

Before proceeding with cleaning, check the current RAM load:

1. Open Settings → About the phone → System status
2. Tap 5 times on the MIUI version to activate Developer Mode
3. Back to Settings → Additionally. → For developers
4. Find the Memory section - here you can see a real-time RAM usage graph.

Method 1: Built-in MIUI cleaning (without root)

The easiest method is to use Xiaomi’s built-in memory manager, which removes unnecessary processes but does not affect system services. Efficiency: frees up 20-40% of RAM.

Instructions:

1. Open Security (the shield icon in the app menu)
2. Go to the Optimization tab (lightning icon)
3. Click Clean in the Memory section
4. Confirm the action, uncheck the boxes from the applications that you do not want to close (for example, a music player)

🔹 If the Clean button is inactive, it means MIUI He thinks that memory is being used optimally, and then try alternative methods.

Close all applications manually (swipe up)

Turn off mobile data and Wi-Fi

Check the battery charge (>20%)

Take a screenshot of the current memory state (for comparison)-->

Method 2: Forced application closure through settings

Some apps (especially games and instant messengers) continue to work in the background even after swiping in the menu of recent ones.

1. Go to Settings → Applications → Application Management
2. Select an app that eats away memory (like Facebook or TikTok)
3. Press Forced Stop.
4. Confirm the action in the dialog window

⚠️ Note: Do not stop system processes with the names com.android., miui. or qualcomm.* – this can cause an interface failure or phone reboot.Exception: com.miui.analytics (com.miui.analytics statistics collection) can be disabled without risk.

Method 3: Limiting background processes

MIUI allows you to manually adjust how many applications can run in the background. The default is Standard, but to save RAM, you better choose Without background processes or Maximum 2 of the process.

How to change it:

1. Activate Developer Mode (if you haven’t already).
2. Go to Settings → Additional → For Developers
3. Find Process Limitation (or Background Process Limit in new MIUI versions)
4. Select Maximum 2 Processes or No Background Processes

🔹 Consequences: Notifications may be delayed, and some applications may reboot when they are returned, but RAM will be freed up by 30 to 50 times%.

💡

If notifications from messengers have stopped coming after limiting background processes, add them to AutoRun (Settings → Applications → Application Management → AutoRun).

Method 4: Using ADB for deep cleaning

For advanced users, there is a method of cleaning RAM through Android Debug Bridge (ADB). It lets you kill processes that are not available through the standard interface. USB-cable.

Instructions:

1. Download ADB Tools and unpack on PC
2. Turn on the phone to debug over USB (Settings → Additional → For developers)
3. Connect Redmi Note 9 Pro to PC and confirm debugging permission
4. Open the command line (Windows) or terminal (Mac/Linux) in the folder with ADB
5. Enter the command to view the list of processes: adb shell ps -A | grep -i "u0_"
6. Find unnecessary processes (e.g. com.facebook.katana) and complete them: adb shell am force-stop com.facebook.katana

⚠️ Note: Don’t kill the name processes system_server, zygote or surfaceflinger, which will cause the system to crash and force you to restart. -9 system-component.

Method 5: Reset partition cache (without data loss)

If RAM is clogged due to a corrupted system application cache, resetting the /cache partition cache will help.This will not delete your files or settings, but requires a reboot.

How to do this:

1. Turn off the phone.
2. Press the Power button + Volume up before the Mi logo appears
3. From the Recovery menu, select Wipe & Reset → Wipe Cache (use volume buttons for navigation, power for confirmation).
4. Confirm the action and wait for the completion
5. Select Reboot → Reboot to System

🔹 Effect: After the reboot, the RAM will be cleared by 15-25%, and system applications will start to work more stable.

Method 6: Disabling animations and speeding up the interface

MIUI uses smooth animations by default that take up RAM and the CPU, and turning them off won't free up memory directly, but will reduce the system's load, which will indirectly help with resource management.

How to speed up the interface:

1. Activate Developer Mode
2. Go to Settings → Additional → For Developers
3. Find the items: Windows animation scale → Select No animation Transition animation scale → No animation Duration of animation → Off.

🔹 Bonus: With animations, turn off debugging GPU (displaying screen updates) – this will reduce the load on the Adreno 618 GPU in Snapdragon 720G.

Method 7: Third-party utilities for cleaning RAM

If standard methods don't work, you can use specialized applications. The best options for the Redmi Note 9 Pro:

• 🛠️ Greenify freezes background apps without root, effective for social media and instant messengers.
• 🧹 SD Maid – clears the cache and residual files that take up RAM. Requires root for full functionality.
• 🔍 Simple System Monitor – shows detailed memory usage statistics and allows you to kill processes manually.

⚠️ Avoid “optimizers” like Clean Master or DU Speed Booster – they often contain ads, collect data and can impair performance. For the Redmi Note 9 Pro, it is better to use lightweight utilities without background services.

Example of working with Greenify:

1. Install the app from Google Play
2. Provide access to special features (Settings → Special features → Greenify)
3. Add apps that you need to “freeze” (e.g. Facebook, Twitter)
4. Activate Aggressive Doze (requires root or ADB-team)

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Third-party utilities have a temporary effect. For stable operation of RAM, combine them with built-in MIUI methods and regularly update the firmware.

FAQ: Frequent questions about cleaning RAM on the Redmi Note 9 Pro