Xiaomi phone brakes and lags: causes and solutions (2026)

Your Xiaomi is slowing down, apps are late, and animations are twitching? This is a common problem that can appear even on flagship models like the Xiaomi 14 Ultra or the budget Redmi Note 12. The causes of brakes range from clogged memory to firmware errors, but in 90% of cases they can be fixed on their own — without going to the service center.

In this article, we will examine all possible causes of lags, from banal overheating to hidden viruses in the system, as well as give step-by-step instructions for diagnosis and repair. MIUI 14/15 And HyperOS, where the brakes are often associated with the background, and if your smartphone is slower after the upgrade, here's the solution.

Before you start taking drastic measures (such as resetting to factory settings), check out simple optimization methods. For example, on models with a Snapdragon 8 Gen 2 processor, the brakes can occur due to improper setting of the performance mode in the system. MIUI. This and other nuances, more.

1.Diagnostics: Why did Xiaomi's phone start to lag?

The first step is to determine what causes the brakes, and the lags can manifest in different ways.

• 🐢 Slowing down the interface – delays when scrolling the menu, opening applications.
• 🔄 Hanging - the screen "freezes" for a few seconds, then sharply works out all actions.
• 🔥 Overheating – the phone becomes hot, starts to “trouble” when playing or charging.
• 📉 High CPU load – in the task manager it is visible that the processor is loaded on 80-100% for no apparent reason.

Most often it's the fault:

• 🗑️ Clogged cache – temporary application files take up gigabytes of memory.
• 🦠 Viruses or malware – especially if you have installed APK unverified.
• 🔄 Firmware conflict - after update MIUI Some functions may not work properly.
• 🔋 Worn-out battery – with battery health below 70%, the system forcibly limits performance.

For quick check:

1. Open the Settings. → The phone. → System status and look at CPU/memory load.
2. Run Security → Scan for Viruses.
3. Check the temperature of the processor in the application CPU Monitor (norm: up to 45)°C to the plain).

2.Cache and garbage cleanup: the first step to speeding up

So, to start with, the simplest thing is to delete temporary files, and the cache of applications and systems can take up to a few hours. 5-10 GB of memory, which is critical for models with 64/128 Cleaning won't delete your data (photos, messages), but will make room for normal operation.

How to clear the cache:

1. Go to Settings → Applications → Application Management.
2. Select an app (such as Facebook or Instagram) → Warehouse → Clear the cache.
3. For mass cleaning, use the settings → Warehouse → Cleaning (in) MIUI 14+ This option is called Freeing up a seat).

For deep cleaning of system debris:

• 🧹 Use the built-in Security app → Optimization → Deep cleaning.
• 🚀 Install. SD Maid (from Google Play) to delete residual files from remote applications.
• 📁 Check the folder. DCIM/.thumbnails — Here are stored miniatures of photos that can weigh gigabytes.

Attention! Don't cache system applications like com.android.systemui, which can cause interface failures. If you're not sure what you're deleting, skip this.

3. MIUI Optimization: Hidden Settings for Acceleration

Firmware MIUI (And the new HyperOS has a lot of hidden features that you can use to improve performance, like the developer settings, which have options to limit background processes and speed up animations.

How to turn on the developer mode:

1. Go to Settings. → The phone.
2. Tap 7 times on the MIUI version (you will be notified "You became a developer").
3. Back to Settings → Additionally. → For developers.

What settings to change:

For models on HyperOS (for example, Xiaomi 14 or Redmi) K70) additionally:

• 🔧 Turn it off. MIUI Optimization through ADB-Adb shell settings put global miui_optimization_disabled 1 This will remove unnecessary background services, but may disrupt some chips MIUI (for example).
• 📊 Turn on Force. GPU Rendering in the developer settings for smooth interface.

4.Firmware problems: Update, rollback and reset

If the lags appeared after the update MIUI, It's the new version of the firmware that's to blame:

• 📱 Xiaomi 13T post-update MIUI 15 (Problems with camera drivers).
• 📱 Redmi Note 11 on the MIUI 14.0.4 (high load bug on kworker core).
• 📱 POCO F5 After switching to HyperOS (conflict with Google Services).

Decisions:

1. Reverse to the old version MIUI: Download the firmware you want from miuirom.org (choose Stable, not Developer). → The phone. → Updating the system → Threefold → Select a firmware file.

Reset to factory settings

• Make a data backup in Settings → Google → Backup.
• Go to Settings → About the phone → Reset settings.
• Handheld firmware via Fastboot (for experienced): fastboot flash all firmware.zip fastboot reboot

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If the phone still brakes after reset, try flashing Global ROM China ROM — Chinese versions often lack optimization for international services (Google Play, Facebook).

Attention! If you roll back on the old firmware, anti-rollback protection may work, and the phone will turn into a brick. 4PDA or XDA-Developers.

5. Battery and overheating: hidden causes of brakes

If your Xiaomi is over 50°C and starts to "trouble," the thermal throttling is to blame -- the system forcibly reduces performance to avoid damaging the chipset:

• 🔥 Models with Snapdragon 888/8 Gen 1 (Xiaomi 11T, Black Shark 4 — known for overheating problems).
• 🔋 Phones with worn-out battery (health below 70%).
• 🎮 Devices during games (Genshin Impact, Call of Duty Mobile).

How to check the status of the battery:

1. Enter the dialer code: ##4636## → Battery information.
2. Or use the AccuBattery app (showing real wear in %).

Decisions:

• ❄️ Refrigeration: Remove the case while charging/playing. Use a cooling stand (e.g. Black Shark FunCooler Pro).
• 🔧 Power Saving Settings: Disable Adaptive Battery in Settings → Battery. → Modes. Turn on the play-by-play performance mode.
• 🔄 Battery replacement: If your health is below 70%, contact the service.The replacement cost for Xiaomi is between 1,500 and 4,000 ₽.

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On models with Snapdragon 8 Gen 2 (such as Xiaomi 13 Pro), overheating can be caused by a malfunction of the thermal paste, which requires disassembly and re-applying the paste at the service center.

6. Viruses and Malware: How to Check and Remove

If the phone starts to brake after installing apps from unknown sources (especially games or hacked" APK), There's a high chance of getting the virus:

• 📈 Unexplained traffic consumption (check in Settings) → SIM-maps and mobile networks → Using traffic).
• 🔋 Quick battery discharge even in standby mode.
• 📦 Appearance of unknown applications (e.g. com.android.system.update).

How to remove viruses:

1. Launch the built-in scanner: Security → Scanning. → Deep inspection.
2. Install Malwarebytes or Kaspersky Mobile for additional check-up.
3. Check the list of installed applications: Settings → Annexes → Application management → sorting.

If the virus is not removed:

• 🛡️ Turn on Safe Mode (click the off button) → "Safe Mode") and remove suspicious applications.
• 🔄 Reset to factory settings (see section 4).
• 📲 Check the phone via Fastboot (instructions are available for you) 4PDA).

Attention! Some viruses are disguised as system applications (e.g. com.qualcomm.atfwd). MIUI.

7. Hardware problems: when to carry in the service

If all the software methods didn't work, the brakes could be caused by hardware.

• 💾 Worn flash memory – if the phone often freezes when reading / writing files (for example, when shooting a video).
• 🔌 Faulty plume – can cause lags when you press the screen or connect charging.
• 🔥 Chipset overheating – if the phone shuts down when it’s above 60°C.
• 🔋 Bloated battery – presses on motherboard, causing crashes.

How to diagnose:

For models older than 3 years (for example, Xiaomi Mi 9, Redmi Note 8 Pro) a common problem is the wear of eMMC memory. AIDA64 (storage → If the Reallocated Sector Count value is above 10, the memory needs to be replaced.

Cost of repair (approximately):

• 🔧 Battery replacement: 1500–4000 ₽.
• 💾 Replacement of flash memory: 3000-8000 ₽.
• 🔥 Chipset soldering: 5000-15,000 ₽.

8. Alternative solutions: if nothing has worked

If all of the above methods fail, try radical measures:

1. Installation of custom firmware

Firmware like LineageOS, Pixel Experience or ArrowOS are devoid of “heavy” components MIUI They work faster, though:

• ⚠️ You will need to unlock the bootloader (can be done via Mi Unlock Tool).
• ⚠️ On some models (Xiaomi) 12S Ultra unlocking will result in loss of wide-angle camera.
• ⚠️ The guarantee will be cancelled.

2. Use of the phone in "Lite" mode

For weaker models (e.g. Redmi) 9A) possible:

• 📱 Set up a launcher GO Launcher or Nova Launcher instead of the standard.
• 🔧 Disable all animations in the developer settings.
• 🚫 Remove unnecessary system applications through ADB: adb shell pm uninstall -k --user 0 com.miui.weather

3.Buying a new phone

If Xiaomi is older than yours 4-5 years (e.g. Mi) A2, Redmi Note 5), Perhaps his resources have been exhausted. 2026 Minimum requirements for comfortable work:

• 📱 4 GB of RAM (for multitasking).
• 📱 Snapdragon 6xx Dimensity 700+ (play-off).
• 📱 UFS 2.2 (for fast download of applications).

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On models with Snapdragon 4xx (Like Redmi. 10A) Lags are inevitable because of a weak processor, and it's only going to help if you replace it with a more powerful device.

FAQ: Frequent questions about lags on Xiaomi