Why Xiaomi Redmi 8 is slowing down: reasons and solutions for accelerating the smartphone

Xiaomi Redmi 8

Redmi 8

Brakes can manifest themselves in many ways, from the rare friezes of a camera launch to the constant lags of gaming or scrolling through social media lists. Most often, it is not the breakdowns that are to blame, but the accumulated digital garbage: fragmented memory, overloaded cache, conflicting background processes. But sometimes the root of evil lies deeper — in a worn-out battery, overheating a chipset or even in a factory marriage. Next, we will analyze all possible causes and give step-by-step instructions for eliminating them, from the simplest to the most radical.

Before you start your diagnosis, answer two key questions:

1. Did the brakes appear suddenly or gradually increase?
2. Is the problem manifesting itself in specific applications or throughout the system?

This will help narrow the search and save time.

1. Overloading of RAM (RAM)

Redmi 8 is equipped with 3 or 4 GB of RAM (depending on the modification), but even this may not be enough with active multitasking. Android has a peculiarity: the longer the smartphone runs without rebooting, the more background processes accumulate in memory. Over time, they begin to conflict with each other, eating resources and causing hang-ups.

How to check the RAM load:

1. Open Settings → About the phone → Memory status.
2. Look at the RAM usage chart. If it's less than 500 MB free, it's at its limit.

Decisions:

• 🔄 Reboot your smartphone regularly (at least once a day). 2-3 This clears the cache and removes the "hungry" processes.
• 🚫 Close unused applications through the Latest Tasks menu (swipe up with a delay).
• ⚙️ Disable auto-run of unnecessary programs: Settings → Annexes → Auto-start.
• 📱 Use Light Mode (if available in your firmware): it limits background activity.

⚠️ Note: Do not install “memory optimizers” from Google Play – they often cause the brakes themselves, consuming resources in the background.

2.Crowded storage: why 100% memory = 100% lag

Redmi 8 was released with 32/64/128 GB of internal memory. Even if you have a top version, over time, accumulated debris (cache, temporary files, duplicate photos) can take up critical 80-90% of the space. When less than 10% of the memory is free, Android begins to slow down: the system has nowhere to write temporary files, and fragmentation of data slows down the read / write.

How to check:

• Go to Settings. → Warehouse.
• If the System or Other section is more than 15-20 GB, that’s a worrying sign.

Cleaning methods:

• 🗑️ Remove the app cache: Settings → Warehouse → Cache data (not to be confused with “Clear Data»!).
• 📸 Move your photos/video to the cloud (Google Photos, Mi Cloud) or on PC.
• 🎵 Remove downloaded music/podcasts from apps (Spotify, Yandex Music often cache gigabytes of data).
• 🔍 Use the built-in cleaner (Security) → Cleaning) for garbage retrieval.

⚠️ Warning: If the memory is quickly filled up after cleaning, check your smartphone for viruses (for example, through Malwarebytes.

3.Outdated firmware or MIUI errors

Redmi 8 officially received the latest major update to MIUI 12.5 based on Android 10. If your device has not been updated for a long time, this can be the cause of the brakes: older versions of MIUI often have memory management bugs that cause lags. In addition, new versions of applications (for example, Instagram or Telegram) are optimized for fresh OS and can conflict with the old firmware.

How to check the MIUI version:

1. Open the settings → About the phone → version of MIUI.
2. Compare this with the latest updates available on Xiaomi’s official website.

What to do:

• 🔄 Update the firmware through Settings → Update system. If there are no updates, try manually through Select Service Pack (download the full service pack). ROM Xiaomi).
• 🛠️ If you can’t upgrade, consider switching to custom firmware (like Pixel Experience or LineageOS) that requires unlocking the bootloader and may take away warranty!
• ⚙️ Reset the settings to factory (Settings) → Additionally. → Recovery and reset) if the lags appeared after the update.

4. Worn-out battery: the hidden cause of brakes

The Redmi 8 battery (5,000 mAh) is designed for 300-500 charging cycles, after 2-3 years of active use, its capacity drops to 60-70%, and the power controller begins to limit the performance of the chipset (Snapdragon 439) to reduce battery load, which manifests as sudden “slowdowns” at low charge or during play.

How to check the status of the battery:

• Install the AccuBattery app (showing real capacity and wear).
• If the capacity fell below 3000 mAh - the battery is critically worn.
• Check Settings → Battery → Use: if the smartphone discharges in 4-5 hours without active use, it’s time to change the battery.

Decisions:

• 🔋 Replace the battery (cost) ~1500–2500 ₽ The original batteries are searched for by the item. MBJ4055.
• ⚡ Turn off battery optimization for critical applications: Settings → Battery. → Choice of applications → set "No restrictions».
• 🔌 Don’t use cheap chargers – they speed up battery wear.

⚠️ Note: If after replacing the battery, the smartphone began to overheat - most likely, a poor-quality battery is installed.The original Xiaomi battery should not heat up above 40°C when charging.

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Before replacing the battery, back up your data via Settings → Additional → Reserve and Reset – sometimes a reset is required after repair.

5. CPU overheating: when iron fails

Redmi 8 is built on the chipset Qualcomm Snapdragon 439 – a budget processor with 8 cores Cortex-A53 (frequency up to 2.0 GHz for long loads (games, video editing, AR-It's prone to trottling, which is a forced frequency reduction due to overheating, and it's a sharp drop. FPS, «Friezes" and spontaneous closures of applications.

Causes of overheating:

• 🔥 Dust-clogged radiator/heat tube (relevant after 2)+ years).
• 🎮 Long-term gaming sessions (especially in the PUBG Mobile, Genshin Impact).
• ☀️ Use in the sun or in a hot room (critical temperature for Snapdragon 439 – 85)°C).
• 🔄 Background activity of Google Services or Mi Cloud (check in Settings) → Battery).

How to reduce heat:

• 🧊 Use a cooling stand or fan when playing.
• 🔧 Limit it. FPS in games through graphics settings (for example, in PUBG Set up a “balanced” regime).
• 🛠️ Clean the charger and speaker connector from dust (can be compressed air).
• 📉 Turn off background sync for unnecessary accounts (Settings) → Accounts).

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If the smartphone heats up even in a simple (for example, when watching a video), this may indicate a malfunction of the power controller or a short circuit on the board, in which case a diagnosis is required at the service center.

6. Viruses and malware

Redmi 8, like any Android device, is vulnerable to viruses, especially if you install apps from third-party sources (APK-Malware can be used to:

• 🕵️‍♂️ Stealing data in the background by loading the processor.
• 📊 Show hidden advertising by consuming memory.
• 🔄 Replace system settings by causing conflicts.

Signs of infection:

• A sharp increase in traffic or battery consumption.
• Appearance of unfamiliar apps on the menu.
• Redirect to advertising sites when opening the browser.

How to check and clean:

1. Install Malwarebytes or Dr.Web Light and perform a full scan.
2. Check the list of installed applications (Settings → Apps) for suspicious programs (for example, with names like System Update, Flash Player).
3. If viruses are detected, delete them and reset your settings.

⚠️ Warning: Some viruses disguise themselves as system applications (e.g. com.android.system) If you are not sure, don't manually delete anything, contact a specialist.

7. Conflicts after updates or resets

Sometimes the brakes appear after:

• 🔄 Updates MIUI (particularly by air»).
• 📱 Resetting to factory settings.
• 🔧 Rooting or installation of custom Recovery (TWRP).

In such cases, the following help:

• 🔄 Hard Reset via Recovery: Turn off your smartphone. + Volume up before the Mi logo appears. Select Wipe Data → Wipe All Data.

Mi Flash Tool

⚙️ Retraction to the previous version MIUI (If the lags started after the update).

Critical information: If after reset, the smartphone has got stuck on the Redmi logo for longer than 10 minutes - do not try to interrupt the process! this can lead to a "brick" (complete inoperability) of the device.

8. Hardware malfunctions: when it's time to go to service

If all software methods are tried, but Redmi 8 continues to slow down, the problem may lie in the hardware:

• 💾 Wear of flash memory (especially relevant for models with 32 GB). After 3-4 years of intensive use, memory cells degrade, which leads to slow reading / writing.
• 🔌 Motherboard malfunction (for example, chip detachment or contact oxidation).
• 📡 Module problems Wi-Fi/Bluetooth (It can cause a freeze when connecting to the network).

Signs of hardware problems:

• The brakes are accompanied by artifacts on the screen (strips, flickering).
• The smartphone spontaneously restarts or turns off.
• Lags appear even after complete reset and firmware.

What to do:

• 🛠️ Average cost of repair: Replacement of flash memory: 3000-5000 ₽. Chip soldering: 2000–8,000 ₽ (Replacement of motherboard: 5000-10,000 ₽ (Unprofitable for a budget smartphone).
• 🔍 If repairs are too expensive, consider buying a new device (e.g. Redmi 10 or a new one). POCO M5 budgetary alternative).

⚠️ Warning: rollbacks could lead to data loss. make backup!