Owning a Xiaomi Redmi 9 smartphone can be a challenge if web pages load for hours and videos are constantly buffered. Low connection speeds are often not due to the provider, but to the software settings of the MIUI operating system. Many users do not even suspect that standard network settings can limit the real bandwidth of the channel.
In this article, we will discuss the technical aspects of the communication modules of your device. DNS-And then we're going to use servers, we're going to change Wi-Fi settings, we're going to clean up the system cache, which often blocks normal data transmission.
We won't use third-party accelerator apps, which are often the cause of the brakes themselves, all of which are based on built-in Android features and deep system settings, and it's safe, free, and it gives you real performance gains on the network.
Diagnostics of the current state of the network
Before making changes, you need to understand the real picture, and often the problem is not the speed of the channel itself, but the instability of ping or packet loss, and you should start with the built-in speed test in the Security app or use the Speedtest by Ookla service.
Pay attention to Download and Upload rates, if they are significantly lower than your rate, then the problem needs to be solved. Ping parameter is also important: high values make online games and video calls impossible even at a good download speed.
⚠️ Note: If the indicator shows 4G or LTE, But the Internet is down, maybe the traffic limit is exhausted, or there's some technical work going on with the carrier.
Check if the traffic saving mode is activated, which artificially compresses data and slows down the browser. SIM-It's only useful when activated at a critically low megabyte balance.
Configure DNS to speed up response
One of the most effective ways to speed up the internet on Redmi 9 is to change the way you do it. DNS-By default, your device uses your provider's servers, which can be overloaded or slow to process requests.Switching to public servers from Google or Cloudflare often reduces response time.
To change your settings, go to Settings → Connection and Sharing → Private DNS. You must select the option “DNS Provider Host Name” and enter the address manually. This action applies to all networks, including mobile Internet and Wi-Fi.
Use the following verified addresses to enter into the settings field:
- 🔹 dns.google – a reliable server from Google, providing stability.
- 🔹 1dot1dot1dot1.cloudflare-dns.com — one of the fastest DNS worldly.
- 🔹 dns.adguard.com – a server that also blocks ads in apps.
When you enter the address, make sure to click "Save." If the Internet is gone, return the setting to "Auto." Not all providers work correctly with encrypted devices. DNS-requests, although in the CIS it is rare.
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Use the Ping & DNS app to check the response speed of various servers before installing them on the system.
Optimization of Wi-Fi Module settings
Budget processors installed in Redmi 9 sometimes mismanage the power saving of the Wi-Fi module. The system can prematurely turn off the antenna to save charge, leading to breaks and a long reconnection.
Go to Settings → Wi-Fi → Wi-Fi settings (or “Advanced Settings”). Find “Use Wi-Fi in Sleep mode” and select “Always” to ensure that background applications receive data without delay.
Also worth paying attention to the frequency range. Redmi 9 supports the 802.11ac standard, but by default can cling to an overloaded 2.4 GHz band. If your router is dual-band, force the phone to connect to a 5 GHz network.
| Parameter | Range 2.4 GHz | 5 GHz range |
|---|---|---|
| Speed. | Low/Mediocre | Tall. |
| Range. | Tall (punctures walls) | Medium (impediments are worse) |
| Workload | Very high (neighbors, household appliances) | Low. |
| Stability | Unstable. | Tall. |
If you are far from the router, the phone will switch to 2.4 GHz, but within the same room try to stay on the 5 GHz network.
☑️ Checking Wi-Fi settings
Reset network settings and APN access point
Accumulation of errors in the configuration of access points (APN) — This is especially true if you change frequently. SIM-If you're traveling or mapping, resetting your network settings will return the settings to factory values, eliminating software conflicts.
To reset, go to Settings → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth. Press Reset button. The phone will reset the network modules.
⚠️ Note: After resetting, you will have to re-enter passwords from all saved Wi-Fi networks and re-pair Bluetooth devices (earphones, watches).
If the problem persists, check the access point settings manually. SIM-maps and mobile networks → Access points (APN) Choose your operator. Make sure that the "Type" field is APN" Prescribed default,supl. the presence of excess text or spaces can slow the connection.
For advanced users, you can create a new access point with optimized parameters. Create a new APN, call it, for example, "FastInternet", and in the "APN Protocol" field, select IPv4/IPv6. This will allow the device to choose the optimal protocol dynamically.
Hidden settings and engineering menu
The MIUI shell contains additional control features for the radio module, which can be accessed through an engineering menu or special codes, and be careful: changing unknown parameters can lead to unstable operation of the phone.
Try dialer code ##4636##. If the menu opens, select "Phone Information." Here you can find "Preferred network type." Set the value LTE Only (Only) LTE), If you are in a safe place of reception.
This one will prevent the phone from switching to slow 3G or 2G during signal weakening, however, if you leave the 4G coverage area, the internet will completely disappear, and incoming calls may not pass (depending on the operator and VoLTE support).
What if the code doesn't work?
Another important parameter is the limitation of background activity. In the Applications → All apps, find heavy programs (social networks, browsers), go to "Saving Charge" and select "No restrictions" that will allow them to update content in the background without delay.
Impact of system updates and cache
Outdated firmware may contain bugs that affect network drivers. Xiaomi regularly releases security and optimization updates for the Redmi 9. Check for updates in the Settings menu → About Phone → MIUI version.
The accumulated cache of system services can also slow down the network, cleaning the cache will not delete your personal data, but will reset temporary files that may have been damaged, you can do this through the recovery menu (Recovery Mode) or using the built-in utility Cleanup.
Reboot the device periodically, and if you run for long periods without rebooting (more than 3-4 days), errors accumulate in RAM, and network sockets can stick. A simple reboot once a week does wonders for connection stability.
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Regularly restarting your smartphone and updating your firmware are the easiest, but often ignored, ways to keep your internet speeds running.