Why the Internet is slowing down on Xiaomi phone: a full analysis of the causes and solutions

Have you noticed that pages in the browser load for eternity, videos on YouTube are constantly “buffering”, and messengers send messages with a delay? Slow Internet on Xiaomi smartphones is one of the most common problems faced by users of Redmi, POCO and the flagship series Mi or Xiaomi 13/14. And it is not always the fault of the operator: 70% of the time the brakes are caused by the settings of the phone or the features of the MIUI firmware.

In this article, we will analyze all possible causes - from banal (overloaded network) to specific (conflict). IP-address MIUI 14) You will learn how to diagnose a problem in 2 minutes, what settings are available MIUI It affects speed, and why even the new Xiaomi 14 Pro can slow down on the Internet.

1.Problems with SIM-card-carrier

The first thing you need to check is whether the operator is responsible, and even if you have unlimited rates, the speed can drop because of:

• 📶 Base station congestion (especially during rush hour or concerts).
• 🔄 Wrong type of network (phone clinging to the phone) 2G instead 4G/5G).
• 🛑 Lockdowns IMEI (If the phone is purchased unofficially).
• 📱 Damaged. SIM-cards (microcracks on a chip or contact oxidation).

How do you check? Put the SIM in another phone (like an iPhone or Samsung) and measure the speed through Speedtest. If there's the same problem, call the operator. If the speed is normal, look for the reason in Xiaomi's settings.

Important for owners of POCO and Redmi Note: some models (for example, POCO X3 Pro) have problems with support for 5G bands in Russia.

2. Incorrect settings of mobile Internet (APN)

APN files (Access Point Name) are a bridge between your phone and the carrier network, and if they get lost or outdated, the speed can drop by up to 10 times, especially after you update your MIUI or reset your settings.

How to check and correct:

1. Go to Settings. → SIM-maps and mobile networks → [yours SIM] → Access points (APN).
2. If there are several profiles, choose the one that corresponds to your operator (for example, Internet.mts.ru for MTS).
3. If the profile is one, but the speed is low – click Reset to the default values.
4. Reboot the phone.

For advanced users, if the automatic profile doesn't work, you can create APNs manually.

There's a bug in MIUI 14: Once you upgrade, APNs are reset to standard ones, but they're not activated, so you can manually select a profile and reboot your phone.

3. Speed Limits in MIUI (Background Optimization)

MIUI aggressively saves traffic and battery by blocking background processes, which means messaging apps (WhatsApp, Telegram) may not be updated in real time, and file download speeds may slow.

How to disable restrictions:

1. Go to Settings → Applications → Application Management.
2. Select an app (such as Chrome or YouTube).
3. Press Battery Limitations → No restrictions.
4. Turn on Auto Start and Background Activity.

To completely disable optimization:

1. Enter the Settings → Search query “Battery Optimization”.
2. Select Battery Optimization → Three Dots (Menu) → No Limits
3. Add the necessary applications to the exceptions.

💡

If after switching off the optimization, the phone began to discharge faster, turn on the Power Saving mode manually (in the notification curtain), but leave exceptions for key applications.

⚠️ Note: On some models (Redmi) 9A, POCO M3) You may have lags after you turn off the optimization, and then you can return the settings and try an alternative way. → Special facilities → Remove animations (reduces processor load).

4. Conflicts IP-addresses and problems with DNS

If sites open slowly, but Speedtest shows normal speed – it’s the fault DNS-The server is used by Xiaomi by default. DNS Operators who are often overloaded.

How to change DNS:

1. Go to Settings → Connections and Sharing → Private Network (Wi-Fi) → [your network] → Change the network → Additional → IP settings.
2. Select Static (instead of DHCP).
3. In the DNS 1 and DNS 2 fields, type 1.1.1.1 8.8.8.8 (this is the DNS from Cloudflare and Google).
4. Save and reconnect to the network.

For mobile Internet:

• Install the DNS Changer app from Google Play.
• Select Cloudflare or Google DNS.
• Activate. VPN-regime (if required).

⚠️ Attention: On some firmware MIUI (especially custom) modification DNS The solution is to install the NetGuard app and block access to the app. DNS manually.

5. Overloading cache and application data

Over time, the cache of apps (Chrome, Instagram, TikTok) inflates to gigabytes, and temporary files slow down the network, especially on low-cost models (Redmi 10A, POCO C31) with a small amount of memory.

How to clean:

• 🧹 Cache cleanup: Settings → Annexes → [select] → Warehouse → Clear the cache.
• 🗑️ Deletion of data: Same menu → Clear the data (⚠️ This will reset the application settings!).
• 🔄 Resetting network settings: Settings → Connections → Resetting Wi-Fi, Mobile Network and Bluetooth.

For deep cleaning:

1. Install SD Maid or Files by Google.
2. Run the garbage analysis.
3. Delete temporary files (.temp,.log).

💡

Clear the cache of Google Play Services and Google Play Store once a month – they often slow down the download of updates.

⚠️ Attention: On Xiaomi with MIUI 12.5+ There's a bug: once the cache is cleared, Google Play Services may stop working notifications. The solution is to restart the phone and wait for sync (5-10 minute).

6. Problems with firmware and MIUI updates

MIUI is known for network bugs, especially in the beta versions.

• V MIUI 13 for Redmi Note 11 was a cliff-bug 4G-switching-over.
• In MIUI 14 on Xiaomi 12T, some users complained about the drop in 5G speeds after the update.
• On POCO F3 after upgrading to Android 13 lost the signal VoLTE.

How to check and correct:

1. Make sure you have the latest version of MIUI: Settings → About Phone → System Update.
2. If the problem has occurred after the update, try to roll back: Settings → About Phone → MIUI Version → Three Dots (menu) → Select the service pack (you need a firmware file from the 4PDA forum).
3. For a radical solution, reset to factory settings (but save the data first!).

If it doesn’t help, check if your model is on the list of well-known bugs on the official Xiaomi forum.

7 Hardware problems: antenna, modem or battery

If the software methods did not help, the reason may be iron:

• 📡 Damaged antenna (for example, after falling or getting moisture).
• 🔋 Worn-out battery (at a discharge below 15%, the modem may limit speed).
• 🔌 Faulty modem (frequent problem with Redmi) 8/9 after 2-3 years).
• 🛠️ Bad contact. SIM-cards (especially if the phone falls).

How to diagnose:

1. Check the signal: Enter the code ##4636##, select Phone Information and look at ASU (Network Signal). If the value is below 10, the antenna problem.
2. Modem test: Call the phone from another device, if the call is interrupted or the sound "breaks" - the modem is defective.
3. Battery check: Install AccuBattery and look at Battery Health. If it's below 80%, it's time to change.

⚠️ Attention: Xiaomi with Snapdragon 4xx/6xx (Like Redmi. 9C, POCO M2) frequently RF-Symptoms: the phone sees the network but can't connect. The solution is just replacing the chip at the service center.

8 External factors: interference, viruses, VPN

Sometimes the problem is not the phone, but the environment.

• 🛡️ VPN or proxy: Free of charge VPN (Turbo VPN, Super VPN) They can limit speed. Turn them off in Settings. → Connections → VPN.
• 🦠 Viruses: Some Trojans (Android.Triada) steal traffic for mining. check Malwarebytes phone.
• 📶 Interference: Microwaves, wireless headphones, or neighboring Wi-Fi networks on the same channel can jam the signal.
• 🌐 Geo-blocking: Some sites (e.g. Netflix) limit speed for low-traffic regions.

How to check:

1. Turn off the VPN and re-measure the speed.
2. Check your phone for viruses (we recommend Kaspersky Mobile).
3. Change the Wi-Fi channel on the router (for example, from 6 to 11).
4. Try connecting to another network (for example, share the Internet from another phone).

💡

If the speed drops only on specific sites (for example, VKontakte or Tinkoff), the problem is not in the phone, but in the blocking by the resource or provider.

FAQ: Frequent questions about slow internet on Xiaomi