Your Xiaomi suddenly began to “think” when opening apps, hanging for a second when scrolling through tape or completely stops responding to touch? This problem is familiar to most owners of smartphones of the brand — from budget Redmi to flagship Mi and POCO. But unlike the myths of “planned obsolescence”, the brakes almost always have a specific reason that can be eliminated without contacting the service.
In this article, we will not be spraying on general tips like “clean up the cache” (although this is important); instead, we will be looking at 12 real causes of brakes, from basic to hidden, with step-by-step diagnostic instructions. You will learn how to distinguish software lags from hardware problems when resetting to factory settings helps, and when only replacing the battery. At the end, you will find an FAQ with answers to sharp questions (for example, why the new Xiaomi 14 models brake more than the old Redmi Note 10).
1. RAM overload (RAM): myths and reality
The most common reason for brakes is a lack of RAM, but here lies the catch: many users mistakenly believe that if the task manager is free 1-2 GB out of 8 GB, then there should be no problems. In practice, even 4 GB of free RAM can not save from lags if the system is not properly managing background processes.
How does it work in Xiaomi? Smartphones MIUI They aggressively kill background applications, but often leave unnecessary system services running. For example, com.miui.analytics (statistics collection) or com.xiaomi.midrop (file sharing) can consume up to 300-500 MB RAM even when you don't use them.
- 🔍 How to check: Open Settings → The phone. → Status of the system → Memory. Pay attention to the "Used System" section, if there's more. 2-3 GB, this is a wake-up call.
- ⚡ Quick solution: Enable the “Light animation” mode in Settings → Special facilities → Improved productivity. That reduces the burden on the GPU and CPU switching between tasks.
- 🛠️ Radical Method: Turn Off Optimization MIUI through ADB-Adb shell settings put global miui_optimization_disable 1 Warning: This can lead to increased battery consumption!
A critical mistake many users make is using Google Play’s RAM boosters. Apps like RAM Booster or Clean Master not only fail to help, but also aggravate the brakes, forcing the system to constantly reboot the background processes.
2. Degraded battery: how it affects performance
Few people know, but a worn-out battery can cause brakes even on top Xiaomi models, because when the capacity drops below 70-75%, the power controller starts to limit the performance of the processor to avoid a sudden shutdown, this is called "throttling."
Symptoms of the problem:
The smartphone brakes sharply when the charge is below 20-30%.
After the firmware update, the lags have increased (new versions of MIUI are more strictly related to worn-out batteries).
In games or benchmarks (such as AnTuTu), performance drops by 30-40% when charged low.
| Battery capacity | Impact on productivity | Recommendations |
|---|---|---|
| 85-100% | No restrictions. | Keep the charge in the range of 20-80% |
| 70-85% | Easy CPU Limitation When Loading | Turn off the background activity of applications |
| 50-70% | Strong lags, forced closure of applications | Replace the battery or disable the trottling via adb |
| <50% | Critical brakes, occasional resets | We need an urgent replacement! |
How to check the wear of the battery:
1. Enter the code ##4636## in the Phone app.
2. Go to the section "Battery Information".
Compare current capacity with passport capacity (e.g., 5000 mAh for Redmi Note 12 Pro+).
adb shell dumpsys battery set ac 1
Attention:
3. Viruses and malware: hidden resource eaters
A checkpoint: have you ever installed apps from third-party sources (not from Google Play)?Even one such application can infect a system with a virus that will masquerade as a system process. For example, the Android.Triada Trojan is embedded in Zygote (the main Android process) and consumes up to 1 GB of RAM.
Signs of infection:
The smartphone is warming for no apparent reason.
- B Settings → The battery appears unknown processes with high consumption (for example, com.android.system with 20% consumption).
Ads appear in places where they shouldn’t be (such as Wi-Fi settings).
- 🕵️ How to detect: Install Malwarebytes or Dr.Web Light and scan the system. Notice the AccessibilityService apps, which are often used by viruses.
- 🚨 What to do: Go to Settings → Annexes → All apps and sort by installation date. Delete suspicious apps (especially with names like System Update, Flash Player). Reset to factory settings (Settings) → Additionally. → Recovery and discharge).
List of dangerous permissions for applications
⚠️ Warning: Some viruses block access to settings. If you can't open Settings → Apps, reboot your smartphone in Safe Mode (click the power button) → long tap on "Switch off» → «Restarting in Safe Mode»).
4.Overheating: Why Xiaomi 'strangles' CPU when heated
Xiaomi (especially models with Snapdragon 7xx/8xx processors) are prone to overheating due to aggressive overclocking policies. When the chipset temperature exceeds 45-50°C, the system forcibly reduces the CPU/GPU clock frequency - this is called thermal throttling.
How it manifests itself:
In games (Genshin Impact, Call of Duty Mobile) FPS drops from 60 to 20-30 in 10-15 minutes.
When recording video in 4K smartphone begins to “stutter”.
The body heats up even for simple tasks (like watching YouTube).
Turn off automatic brightness|Set a limit FPS play (60 instead 90/120)|Remove the cover during games|Use a cooling stand|Update the firmware (in new versions) MIUI Improved thermothrottle logic)-->
🔥 Extreme case: On POCO F3 Xiaomi 11T Pro with Snapdragon 888 overheating can lead to a shutdown 5G-The modem before the chipset cools, and it manifests as a sudden loss of the network.
| CPU temperature | Effects of consequences | Decision |
|---|---|---|
| 40-45°C | A slight decrease in productivity | Close the background applications |
| 45-55°C | Limiting FPS in Games, Lags in Multitasking | Activate the Game Turbo mode in Settings → Special. |
| 55°C+ | Forced closure of applications, disconnection of the network | Refrigerate the device immediately (turn it off for 10 minutes) |
5.Outdated firmware or "raw" version of MIUI
Xiaomi is known for frequent updates, but not all of them are stable. For example, MIUI 14.0.3 for the Redmi Note 11 contained a bug that caused the system to spend up to 40% of the CPU on background synchronization of contacts. and MIUI 13 for the POCO X3 Pro was found a bug with a memory leak that led to reboots every 2-3 hours.
How to understand that the brakes are associated with firmware:
The problem occurred immediately after the update.
System logs (Settings → About Phone → Error Report) have records of SystemServer crashes.
On forums (e.g. 4PDA or XDA-Developers), other users complain about similar lags.
- 🔄 How to Reverse to the Old Version MIUI: Download the firmware archive from en.miui.com. Rename the file to update.zip and put it in the root of the memory. Go to Settings. → The phone. → Update the system, tap the icon «⋮» → «Select a firmware file».
Attention:
Settings → Additional → Backup
💡
If the smartphone has become slow after the update, check the version of the Linux kernel with the command adb shell uname -a. If the version is below 4.19.157, this may be the reason for the lag with the F2FS file system (relevant to Xiaomi on the Snapdragon 865/870).
6.Clogged memory: when "garbage" interferes with work
Even if you have 10-15 GB of free space, memory fragmentation and corrupted files can cause brakes, especially for smartphones with eMMC 5.1 memory (such as the Redmi 9A or POCO M3), where read/write speeds drop by 30-40% when memory is filled by 80%+.
What exactly is stopping the work:
App cache: For example, Facebook or TikTok can take up to 5-10 GB of cache.
Residual files: After deleting applications, folders remain in /Android/data and /Android/obb.
- Damaged downloads: Unproven files in the Download folder block memory indexing.
Remove the cache in Settings → Memory. → Clear the cache|Transfer the photo/video to SD-map|Delete the.thumbdata folders through the file manager|Execute Adb shell sm set-force-adoptable true to optimize storage-->
🛑 What not to do:
Use cleaners like CCleaner, which remove important system files.
Format memory via PC (this violates the /data partition structure).
- Delete the MIUI folder at the root of the memory - this will lead to a failure of the themes of design.
7 Application Conflicts: When "Good" Programs Become Enemies
Some apps, even from Google Play, can conflict with MIUI and cause brakes.
Antivirus: Avast, Kaspersky scan files in real time, loading the CPU.
Launchers: Nova Launcher or Microsoft Launcher can duplicate system processes.
- VPN-clients: 1.1.1.1 or ProtonVPN sometimes block system requests to Xiaomi servers.
How to identify the "culprit":
1. Reboot your smartphone in Safe Mode (see instructions above).
2 If the brakes are gone, the problem is in one of the installed applications.
3. alternately remove applications, starting with the last installed, and monitor performance.
| Annex | Symptoms of conflict | Decision |
|---|---|---|
| Greenify | Forced hibernation of system processes | Add com.miui.home to the whitelist |
| Tasker | Clocking scripts, lags when unlocking | Disable the MIUI Optimization profile |
| Google Play Services | High CPU consumption (up to 30%) in the background | Update through Google Play or revert to the old version |
8. Hardware problems: when nothing helps
If you've tried all the software methods, but Xiaomi is still slowing down, the problem may be the hardware.
- 🔌 Display plume: Manifests as touch hovers or "ghost" taps, often after falling or changing the screen.
- 💾 Damaged flash memory: Symptoms - accidental reboots, errors in installing applications, brakes when recording video. Diagnosed via adb shell dumpsys diskstats.
- 📡 Faulty modem: If the smartphone slows only when mobile internet is active (especially in roaming), the problem may be in the antenna module.