How to improve the speed of the Internet on Xiaomi Redmi 9: from settings to hardware tricks

Xiaomi Redmi 9 is one of the most popular budget smartphones, but many users face the problem of slow Internet: sites loaded for eternity, videos on YouTube are constantly “buffered”, the connection disappears at the most inopportune moment, the reasons can lie in both the software settings and hardware limitations of the device.

In this article, we’ll break down 12 proven ways to improve Wi-Fi and mobile internet speeds on Redmi 9 – from basic settings to hidden features. MIUI You'll learn what parameters affect connection stability, how to get around operator restrictions, and what to do if the problem lies in the router itself.

Important: Not all methods are equally effective. DNS It can increase speed by 20 to 30 percent, and turning off the background can reduce ping in games. MIUI 12-14 that were tested on real devices.

1. Checking the current Internet speed: a basic test

Before you set up anything, you need to know how fast you're going and where the bottleneck is.

1. Connect to Wi-Fi or activate mobile internet.
2. Close all applications except the browser.
3. Go to Speedtest or Fast.com.
4. Run the test and record the results: Ping, Download (Mbps), Return (Mbps).

Normal performance for Redmi 9:

• 📶 4G (LTE): 15–50 Mbps (depending on operator and coverage area).
• 📶 Wi-Fi 5 GHz: 50-150 Mbps (if the router supports) 802.11ac).
• 📶 Wi-Fi 2.4 GHz: 10–30 Mbps (may sag due to interference).

If your numbers are much lower, there's a problem, and if the speed is normal, but the sites load slowly, it's either your fault or your fault. DNS, Or the operator (which we will talk about later).

2. Optimize Wi-Fi settings on Redmi 9

Xiaomi Redmi 9 supports Wi-Fi 5 (802.11ac), But it can default to compatibility mode, which slows down:

Choosing the correct frequency: 2.4 GHz vs 5 GHz

If your router supports two frequencies, always choose 5 GHz, which is less loaded and faster.

• ✅ 5 GHz: High speed but shorter range (walls can block signal).
• ❌ 2.4 GHz: slower, but penetrates obstacles.

How to switch:

1. Open the Settings. → Wi-Fi.
2. Click on your network name and select 5 GHz (if available).
3. If there is no 5 GHz network, check the router settings (instruction below).

Activation of the regime «MAX» (only MIUI 12+)

In the firmware MIUI 12 and newer has a hidden Wi-Fi feature MAX, It's a system that prioritizes speed over battery economy:

1. Go to Settings → Wi-Fi → More
2. Turn on the switch Mode. MAX (or high productivity).
3. Reboot your smartphone.

⚠️ Warning: This mode increases battery consumption by 10 to 15 percent.

3. Setting up mobile internet (4G/LTE)

If you have a slow mobile internet connection, the problem may be:

• 📡 Incorrect settings APN (point).
• 📱 Operator restrictions (tarplane, throttling).
• 🔄 Automatic switching on 3G/2G.

Manual setting APN

Sometimes operators reset the settings APN, That's why the speed drops:

1. Go to Settings. → SIM-maps and mobile networks → [Yours. SIM] → Access points (APN).
2. Click Add APN and enter your operator’s options (see table below).
3. Save and restart the phone.

⚠️ Attention: If after the change APN Internet is missing – check that the field type APN Contains default,supl.

Compulsory incorporation 4G (LTE)

Redmi 9 can be switched to the same device automatically 3G or 2G, signal 4G It's weak, to avoid it:

1. Enter the dialer code: ##4636##
2. Select Phone Information.
3. In the Set Preferred Network Type section, select LTE only.

💡 Useful advice: if after that the Internet is gone, return the setting to the LTE/WCDMA/GSM So, in your zone. 4G volatilely.

4. Shift DNS: How to speed up the loading of websites

DNS-servers translate the addresses of sites (for example, google.com) to IP-If the operator's server is slow, the sites will load longer, even with high Internet speeds.

How to change DNS Redmi 9:

1. Go to Settings. → Wi-Fi (or Mobile Network).
2. Click on your network name → Change the network → More
3. In the field DNS enter one of the addresses:

• 🌍 Google DNS: 8.8.8.8 and 8.8.4.4
• 🌍 Cloudflare: 1.1.1.1 and 1.0.0.1
• 🌍 Yandex DNS: 77.88.8.8 and 77.88.8.1

After shift. DNS check the speed DNS If the ping has decreased and the sites have opened faster, the method worked.

💡

Shift. DNS It does not increase the speed of downloading files, but reduces the time to open sites by 20-30%.

5. Cleaning of cache and background processes

Clogged cache and background apps can "steal" traffic and slow down the internet.On Redmi 9s MIUI This is especially true due to aggressive system optimization.

5.1. Cleaning the application cache

Do this once every 1-2 weeks:

1. Go to Settings → Applications → Application Management.
2. Select a browser (Chrome, MIUI Browser) or social networks (Instagram, TikTok).
3. Click Clear Cache and Clear Data (Warning: This Will Delete Saved Passwords!).

5.2. Disabling the autoloading of applications

Many programs (Facebook, VK, AliExpress is running in the background and consuming traffic to prevent it:

1. Go to Settings → Battery and Performance → Autostart Management.
2. Turn off auto-run for unnecessary applications (especially instant messengers and social networks).

⚠️ Please do not disable Autoplay for Google Play Services and MIUI System - This can disrupt the system.

Hardware methods: antenna, SIM card, cooling

If the software settings didn't work, the problem could be the hardware.

6.1 SIM card and slot check

Redmi 9 is supported by 4G LTE, but:

• 🔄 If the SIM card is old (released before 2015), it may not support VoLTE and 4G+.
• 📱 If the SIM card slot is contaminated or oxidized, the signal will be weak.

Decision:

1. Try inserting the SIM card into another slot (if there are two).
2. Clear the contacts of the SIM card and slot with alcohol.
3. Replace the SIM card with a new one (free of charge in the operator’s cabin).

Overheating and its effect on speed

When overheated, Redmi 9 automatically reduces performance, including internet speed.

• 🌡️ Processor temperature (annex) CPU Monitor).
• 🔋 Do not use your phone on charge while playing or watching videos – this increases heat.
• 🧊 Remove the case if the phone is warm in games.

💡 Useful tip: if the phone heats up even in a simple one - check if the battery is swelling (this is dangerous!).

Alternative methods: from VPN firmware

If nothing helps, try radical methods:

7.1 Use. VPN throttle-by-pass

Some operators artificially slow down traffic after the limit is exhausted (even at "no limit" tariffs). VPN Could help get around it:

• 🔒 Install ProtonVPN or Warp (Cloudflare).
• 📈 Connect to a server in your country (for example, Moscow for Russian operators).
• 🛑 If the speed is down, change the server or turn off the server. VPN.

7.2. Flashing on custom software

Stock-stock MIUI Sometimes it limits the speed of the Internet, and the alternative is LineageOS or Pixel Experience:

• ⚠️ This will reset the warranty and could lead to a phone blink.
• ⚡ Requires bootloader unlock (instructions for the bootloader) 4PDA).
• 📲 After firmware check support for VoLTE and Wi-Fi Calling.

🔧 For experienced: if you decide on custom firmware, choose versions with a core optimized for MediaTek Helio G80 (Redmi 9 processor).

FAQ: Frequent questions about the Internet at Redmi 9