Speed up the Internet on Redmi Note 9 Pro: from settings to hidden menus

Redmi series smartphones have been leading the budget and mid-range segment for many years, offering excellent value for money. the Redmi Note 9 Pro model became a real bestseller thanks to the powerful Snapdragon 720G processor and high-quality screen, but even such time-tested devices can show a decrease in the performance of communication modules. Users often face a situation where pages in the browser load slowly and video is buffered, despite the stated high tariff speed.

The problem is often not the provider, but software conflicts or mis-exposed MIUI system parameters. Xiaomi’s operating shell has many background processes that can intercept traffic, and standard energy saving settings sometimes aggressively limit the operation of network interfaces. Understanding how the network stack works in Android will allow you to diagnose and fix most speed problems yourself.

In this article, we'll take a comprehensive approach to improving connectivity, from simple hardware checks to advanced DNS setups to network resets. You don't need to be a communications engineer to do these things, but it's important to follow the instructions carefully so you don't get to knock down important system settings. Let's look at what factors are most likely to affect the speed of data transfer in your device.

Diagnostics of the current state of the network and equipment

Before you make changes to system files or settings, you need to pinpoint the source of the problem. Often, the slow speed on the Xiaomi Redmi Note 9 Pro is due to physical obstacles, outdated router software or congestion of the channel by neighbors. The first step should always be an objective assessment of the situation with specialized utilities, not a subjective feeling of “slow” Internet.

Use apps like Speedtest by Ookla or Fast.com to measure incoming and outgoing speeds and ping. Write down the results at different points in your apartment and compare them to other devices connected to the same hotspot. If you have a laptop or other phone that is fast enough to charge you, and the Redmi Note 9 Pro is much slower, then the problem is localized to your smartphone.

Note the indicators in the status bar: the presence of the letters H+ instead of 4G or LTE indicates that the phone can not catch on to a high-speed tower. In the case of Wi-Fi, it is critical to understand the difference between 2.4 GHz and 5 GHz. The first provides better coverage through walls, but has low bandwidth, while the second gives maximum speed, but at shorter distances.

⚠️ Note: If you see a Wi-Fi icon with the number 6, but the router does not support the Wi-Fi 6 standard, this may be an interface display error. MIUI. In this case, try forgetting the network and connecting again to reset the handshake protocol.

The communication module in the Redmi Note 9 Pro, when heated, can artificially reduce the power of the transmitter to protect components, which directly affects the stability of the connection. If the phone is hot to the touch during tests, remove the case and let it cool before rechecking the speed.

Optimizing Wi-Fi settings and frequency ranges

One of the most common reasons for low speed is operating in the congested 2.4 GHz band. In apartment buildings, this range is literally jammed with signals from dozens of neighborhood routers, microwave ovens and Bluetooth devices. Redmi Note 9 Pro supports dual-band networks, and switching to 5 GHz often gives instant speed gains of 3-4 times if you are in the zone of confident reception.

To force your network to choose, go to your Wi-Fi settings and find your network with a “5G” or “5GHz” label. If the router is broadcasting the same network with a combined frequency (Smart Connect), it is recommended to divide them in the router settings, specifying different names so that the phone always connects to the faster. Some versions of MIUI have a “Wi-Fi Assistant” feature that automatically switches you to mobile Internet at a weak signal, which is also worth checking.

Another important parameter is DNS setup. Standard ISP servers are often slow or blocked. Changing DNS to faster alternatives like Google DNS or Cloudflare can significantly speed up site opening, especially heavy media, and it will not increase the physical speed of the channel, but will reduce server response time.

To change DNS on Android 9 and higher (relevant to Redmi Note 9 Pro), use the "Private" feature DNS» (Private DNS). Go to Settings. → Connection and sharing → Private DNS and select "Host Name of the Provider" DNS». Enter the address dns.google or 1dot1dot1dot1.cloudflare-dns.com. This setting encrypts. DNS-querying, increasing security and often response speed.

Remember that using 5GHz requires proximity to the router. If you go to the back room or bathroom, the signal may disappear where 2.4GHz would still work.

Configuring mobile Internet and LTE parameters

When Wi-Fi is unavailable, the main source of Internet is the mobile network. Owners of the Redmi Note 9 Pro sometimes complain about unstable 4G, although the Qualcomm modem in this device is quite powerful. The problem often lies in choosing the preferred type of network. By default, the system can choose the mode "5G/4G/3G/2G", constantly trying to find the best signal, which leads to breaks and ping spikes.

To stabilize the connection, you should lock in the network type. Go to the engineering test menu by dialing the code ##4636##. Select Phone Information and find the drop-down list "Install preferred network type." Select LTE Only or LTE/TD-SCDMA/WCDMA. This will prevent the phone from slipping into slow 3G (H+) in areas of uncertain 4G reception.

It is also worth checking the settings of the access point (APN). Operators often update their gateways, and the old settings may not work properly. → SIM-maps and mobile networks → Choose. SIM → Access points (APN). Click Reset or create a new access point, making sure that the field is in the field. APN the correct value for your operator is prescribed (for example, Internet.mts.ru or Internet.beeline.ru). APN put out IPv4/IPv6.

If it is enabled globally or for specific applications, the system will restrict background activity, which can slow down the loading of content in messengers or mail. Check the list of applications in Settings → Connection and Sharing → Traffic Savings and remove restrictions on frequently used programs.

⚠️ Note: When using the code of the engineering menu ##4636##, do not change the radio settings (Radio Off) or other settings you do not know. This can lead to the complete disappearance of the network, which is restored only by flashing or resetting to factory settings.

Resetting network settings and cleaning the cache

Errors in network configurations are a common problem with Android, and conflicts accumulate over time. IP-If simple switching doesn't work, the best way to do this is to completely reset your network settings, not delete your personal files, photos or contacts, but bring all your Wi-Fi, Bluetooth and mobile internet settings back to factory settings.

You can reset via the Settings path → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth. After this procedure, the phone will reboot and you will need to re-enter passwords from all Wi-Fi networks. However, statistics show that in 80% of cases this eliminates the problems with constant connection breaks and low speed on the Xiaomi Redmi Note 9 Pro.

In addition to system reset, you should clear the cache of Google Play system services, which are responsible for many network functions and geolocation. Go to Settings → Apps → All Apps → Google Play Services → Memory and click Clear Cache. Don’t confuse it with Clear Everything, although this is safe in most cases, but will require re-authorization in some services.

Also check if you have cleaners or antiviruses that can aggressively block network activity. Avast’s built-in MIUI antivirus is good enough, and third-party programs like Clean Master can create more problems than they solve by constantly unloading necessary network drivers from memory.

Use of hidden functions and engineering menus

For advanced users who want to make the most of their device, there are hidden customization options. MIUI has Game Turbo, which not only optimizes the processor, but also prioritizes network traffic for the running application. Add your games and heavy apps to this list so that the system allocates more network resources to them.

Another method is to change the region, and in some cases, changing the region in settings (Settings → Additional settings → Region) to India or Singapore can unlock additional frequencies or change the modem algorithms, because the hardware and network requirements differ in these regions, and once the region is changed, the phone will restart the radio module, which is useful in itself.

There is also a command to reset application preferences, which can help if a particular program (such as a browser or torrent client) is not working properly with the network. → Annexes → Application management → Menu (three dots) → Reset application settings. This will return all permissions and background activities to the post-install state».

⚠️ Warning: Region change may temporarily increase the number of ads in system applications MIUI Or change the set of pre-installed applications, and bring the region back after checking the network if you notice a negative change in the interface.

Impact of MIUI Updates and Hardware Limitations

Software is a living organism, and each MIUI or Android update can improve or degrade the modem. Often users notice a drop in speed immediately after the system update. In such cases, waiting for a patch from developers helps, but sometimes the problem is solved by a complete reset to the factory settings (Wipe Data) after the update, as old configuration files can conflict with the new version of the OS.

But the hardware is also important. The Redmi Note 9 Pro is not a new device, and the physical wear and tear of the antenna module or the oxidation of contacts inside the case (especially if the phone is dropped) can make itself felt. If none of the software methods worked, and other devices at the same point the Internet works perfectly, you may need to diagnose the antenna in the service center.

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A comprehensive approach, including changing the DNS, fixing the type of LTE network and periodic reset network settings, allows you to maintain high Internet speed on the Redmi Note 9 Pro throughout the life of the device.

Also worth mentioning is memory overload: If internal storage is more than 90% full, the system starts to run slower in all aspects, including processing network packets. Freeing up at least 3-5 GB of free space can have a positive impact on overall interface responsiveness and page load speed.

Frequently Asked Questions (FAQ)