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Ways to ease Wi-Fi traffic when many devices connect

Ways to ease Wi-Fi traffic when many devices connect

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kaisui
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09-19-2025, 10:44 AM
#1
Here are some suggestions to lessen Wi-Fi congestion and boost performance when many routers and clients are connected. This approach is tailored for OpenWRT:

1. Understanding the issue: You might wonder why your 2.4 GHz Wi-Fi seems so fast—up to 300 or 450 Mbit/s—and most devices appear idle, yet usage reaches full capacity.
2. Key point: The Wi-Fi speed adjusts automatically to suit both nearby and distant devices. Devices far away operate at a slower rate.
3. The challenge: Even though your devices are in the same room, there’s a limitation. High speeds only work for direct connections (unicast). Broadcasts, multicasts, beacons, and other signals must be sent at the slowest possible speed so distant devices can still receive them. This is typically handled using older 802.11b standards, often as low as 5.5 or 6 Mbit/s.
4. Recommended setting in OpenWRT: Use the option “Coverage cell density - Network, Wireless, Edit, Advanced Configuration.” By default, it’s turned off for better compatibility with older and faraway clients. Raising it to “Very High” pushes the lowest rate up to 24 Mbit/s, significantly improving broadcast performance.
5. Trade-offs: Setting it too high can cause problems. Legacy 802.11b devices may fail to connect, and network coverage might be restricted. In real tests, I achieved stable connections up to 90 meters with an iPhone 7 Plus and TL-1043ND behind a brick wall.
6. Additional tips:
- Distance Optimization
- Adjust Beacon interval
- Disable General Setup and allow legacy 802.11b rates (to prevent older devices from connecting)
- Configure Multicast packets as Unicast via Interface Configuration or Advanced Settings
- For deeper guidance, explore advanced help in OpenWRT or consider custom firmware.
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K
kaisui
09-19-2025, 10:44 AM #1

Here are some suggestions to lessen Wi-Fi congestion and boost performance when many routers and clients are connected. This approach is tailored for OpenWRT:

1. Understanding the issue: You might wonder why your 2.4 GHz Wi-Fi seems so fast—up to 300 or 450 Mbit/s—and most devices appear idle, yet usage reaches full capacity.
2. Key point: The Wi-Fi speed adjusts automatically to suit both nearby and distant devices. Devices far away operate at a slower rate.
3. The challenge: Even though your devices are in the same room, there’s a limitation. High speeds only work for direct connections (unicast). Broadcasts, multicasts, beacons, and other signals must be sent at the slowest possible speed so distant devices can still receive them. This is typically handled using older 802.11b standards, often as low as 5.5 or 6 Mbit/s.
4. Recommended setting in OpenWRT: Use the option “Coverage cell density - Network, Wireless, Edit, Advanced Configuration.” By default, it’s turned off for better compatibility with older and faraway clients. Raising it to “Very High” pushes the lowest rate up to 24 Mbit/s, significantly improving broadcast performance.
5. Trade-offs: Setting it too high can cause problems. Legacy 802.11b devices may fail to connect, and network coverage might be restricted. In real tests, I achieved stable connections up to 90 meters with an iPhone 7 Plus and TL-1043ND behind a brick wall.
6. Additional tips:
- Distance Optimization
- Adjust Beacon interval
- Disable General Setup and allow legacy 802.11b rates (to prevent older devices from connecting)
- Configure Multicast packets as Unicast via Interface Configuration or Advanced Settings
- For deeper guidance, explore advanced help in OpenWRT or consider custom firmware.

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