If your internet suddenly starts to slow down while playing online and YouTube videos are loaded in snags despite a stable connection, the problem may not be speed, but traffic misallocation. This is where QoS (Quality of Service) technology, a built-in tool in Xiaomi routers that allows you to manage device priorities and data types on your local network, comes to the rescue.
In this article, we will discuss what QoS is in Xiaomi routers, how it works on Mi Router models. 4A/4C/4Q, AX3600, AX6000 And we'll also learn how to customize it to make it work optimally for games, streaming, video calls and background downloads, and we'll learn what settings affect performance, how to avoid common mistakes, and why it's sometimes best to turn off QoS altogether.
What is QoS and why is it needed in a router?
QoS (Quality of Service) is a set of technologies that allow a router to prioritize certain types of traffic or devices on the network. Rather than evenly distribute the available bandwidth among all connected gadgets, QoS “prefers” data that requires minimal latency (such as online games) or stable speed (such as video calls).
Without QoS, your Xiaomi router processes data packets on a first-come-first-served basis, which can lead to:
- 🎮 Laham in games because a torrent or Windows update eats up the entire channel.
- 📺 Hanging up on video 4K-streaming if someone on the network downloads a large file.
- 📞 Zoom or Discord communication breaks when the network is loaded.
QoS solves these problems by automatically or manually sharing bandwidth between devices and traffic types. For example, you can set a rule to play a game. CS2 Always got priority over downloading updates on your smartphone.
How QoS works in Xiaomi routers: principles and limitations
In Xiaomi routers (including Mi Router models) 4, AX1800, AX3000 flagship AX6000/AX9000) QoS is implemented on the basis of two key mechanisms:
- Traffic classification – The router analyzes data packets and determines their type (game, video, download, etc.).
- Priority queues – traffic is distributed in “queues” with different levels of importance (for example, games are the most important queue).
However, QoS in Xiaomi has limitations:
- ⚠️ Does not work at speeds above 1 Gbps – if your 2 Gbps tariff, QoS will be disabled automatically (this is a firmware restriction).
- ⚠️ Does not support deep inspection of packages (DPI) — The router cannot determine exactly what traffic is going on inside the encrypted connection (for example, in the VPN).
- ⚠️ Can reduce overall speed – with active QoS, the maximum network bandwidth can fall by 10-20%.
It's important to understand that QoS doesn't increase your real internet speed -- it just redistributes it across devices. If you're on a 100 Mbps tariff, even with QoS, you won't get 200 Mbps on a single device.
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If you have a tariff faster than 1 Gbps, the QoS in the Xiaomi router will be automatically disabled, in this case, to prioritize traffic, use provider-level settings (if supported) or specialized routers with hardware QoS (for example, use the provider-level settings to prioritize traffic, ASUS RT-AX88U).
QoS Types in Xiaomi Routers: Which to Choose
In the firmware MiWiFi (standard for most Xiaomi routers) available two modes of QoS:
| QoS mode | Description | When to use |
|---|---|---|
| Adaptive QoS | The router automatically determines the types of traffic (games, videos, downloads) and prioritizes the router. | For most users who don’t want to set up rules manually. |
| Manual QoS | You set your own priorities for your devices or ports. | If you want to control exactly which device is getting the most traffic (for example, for a gaming PC). |
| Unplugged. | QoS is not used, and traffic is distributed evenly. | If you have a rate faster than 1 Gbps or QoS, the speed is getting worse. |
Adaptive QoS is convenient because it doesn't require manual adjustment, because the router is trying to optimize the network itself, but it's not perfect: for example, it can mistakenly prioritize background downloads instead of video calls. Manual QoS gives you more control, but it requires you to understand which devices and types of traffic are more important.
On models with OpenWRT firmware (for example, Xiaomi Router) 4A Gigabit Edition with custom firmware) more flexible QoS settings are available, including: HTB (Hierarchical Token Bucket and CAKE (Common Applications Kept Enhanced: These algorithms allow for more precise management of delays and jitter, which is critical for gaming and video conferencing.
Step-by-step QoS setup on Xiaomi router
To configure QoS, follow the following steps (the instructions are relevant for MiWiFi firmware). RU global version):
- Open the router’s web interface by going to 192.168.31.1 (or miwifi.com) and log in.
- Go to the section Additional → QoS (English version: Advanced) → QoS).
- Turn on QoS by moving the slider to the On position.
- Select the mode: Adaptive or Manual.
For manual adjustment:
- Click Add the rule and specify: 📱 Device (select from the list of connected gadgets). 🔼 Priority (low to high). 🌐 Type of traffic (e.g. Games, Videos, Downloads).
Save the settings and restart the router.
Make sure that QoS is enabled in the settings|Check that the rate does not exceed 1 Gbps|Assign high priority to critical devices (PCs, consoles)|Turn off QoS if you notice a speed drop-->
An example of the right setting for a gamer:
- 🎮 Gaming PC – High priority, type of traffic.
- 📺 Smart TV — Medium priority, type of traffic Video.
- 📱 Smartphone (background updates) – Low priority.
After settings, check the speed on your devices using Speedtest. If you notice a drop in speed (over 15%), try disabling QoS or lowering the rules.
What to do if QoS is not working?
Optimal QoS settings for different scenarios
The priorities you prioritize depend on how you use the Internet, and below are your recommendations for situations.
🎮 For online gaming (CS2, Dota 2, Fortnite)
The key to gaming is minimal ping and connection stability.
- 🖥️ PC/Console – Maximum priority.
- 📡 Type of traffic – Games (or UDP-port 27000–27030 for CS2).
- 📴 Limit background downloads on other devices (Priority Low).
📺 For streaming. 4K (Netflix, YouTube, Twitch)
For high-resolution video, stable speed is critical, not minimum ping.
- 📺 Smart TV/Media Player – High Priority.
- 🎥 Type of traffic: Video or HTTP/HTTPS.
- 🔄 Turn off background updates on PCs and smartphones.
📞 For video calls (Zoom, Teams, Discord)
Video conferencing requires a balance between speed and ping.
- 💻 Laptop/PC for calls – High priority.
- 🎤 Type of traffic: VoIP or UDP-port 50,000-60,000 for Zoom).
- 📶 Limit speeds for other devices to 50% of the maximum.
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The priority for gaming is to reduce ping, and for streaming, to ensure a steady speed, so don't give maximum priority to all devices at once, because that negates the QoS effect.
Common errors in QoS configuration and how to avoid them
Many users find that after activating QoS, the network starts to work worse.
⚠️ Note: If your Xiaomi router supports speeds above 1 Gbps (for example, AX6000), QoS will be automatically disabled. Attempt to force it to turn on via SSH or custom firmware can lead to unstable network operation.
Mistake 1: Too many rules
If you have given high priority to more than 3-4 devices, QoS is meaningless – the router can not efficiently distribute traffic. Solution: leave maximum priority only for 1-2 critical devices (for example, a gaming PC and a work laptop).
Error 2: QoS is enabled on a slow rate
If your real internet speed is below 50 Mbps, QoS can make things worse by adding packet processing overhead.Solution: disable QoS and optimize the network in other ways (e.g. limit torrents at the device level).
Mistake 3: Incorrect classification of traffic
Xiaomi router does not always accurately determine the type of traffic (especially if used) VPN Solution: Manually prioritize devices, not traffic types.
Error 4: QoS is in conflict with other functions
If you have Parental Control active at the same time as QoS, VPN-server DNS, Solution: Turn off the redundant services or reconfigure them.
QoS vs. Alternative Ways to Optimize the Network
QoS is not the only way to improve network performance, but in some cases, other methods are more effective.
| Method | Pluses | Cons | When to use |
|---|---|---|---|
| QoS | Flexible prioritization works at the router level. | Can reduce the overall speed, does not work at tariffs >1 Gbps. | To prioritize games, video calls, streaming. |
| Speed Limitation (Bandwidth Control) | It allows you to strictly limit the speed for individual devices. | Does not take into account the types of traffic, requires manual adjustment. | If you want to block torrents on a particular device. |
| Double network (Guest network) + Basic) | Isolates visitor traffic from the main network. | It does not solve the problem of prioritization within the main network. | If you want to separate the working devices from the “guests”. |
| Custom firmware (OpenWRT) | More flexible QoS algorithms (CAKE, FQ_Codel). | It is difficult to configure, the risk of “bricking” the router. | For advanced users with demanding tasks. |
If your Xiaomi router is not up to speed with QoS, try:
- Limit speed for torrent clients at the program level (for example, in qBittorrent set a download/return limit).
- Use it. VLAN for traffic sharing (available on models with OpenWRT support).
- Update the firmware – in new versions of MiWiFi improved the work of QoS.