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Slow WiFi Speeds

ASUS Router

Severity: Moderate

Source: OnlyErrorCodes.com — Every error code. One place.

ASUS Router Slow WiFi Speeds — Fix Guide

What Does This Error Mean?

ASUS router WiFi running slower than expected is most often caused by congested WiFi channels shared with neighbours, devices connecting to the 2.4 GHz band instead of the faster 5 GHz band, or a firmware issue. Use the ASUS router channel analysis tool to find the least congested channel and switch to it.

Affected Models

  • ASUS RT-AX88U
  • ASUS RT-AX86U
  • ASUS RT-AX58U
  • ASUS ZenWiFi AX (XT8)
  • ASUS RT-AC68U

Common Causes

  • WiFi channel is congested with neighbouring networks on the same channel
  • Device is connecting to 2.4 GHz instead of the faster 5 GHz band
  • Router is too far from the device — signal strength is too low for full speed
  • QoS is incorrectly configured, throttling certain devices

How to Fix It

  1. Log in to the ASUS admin panel. Go to Wireless > Professional and use the Site Survey or scan function to see which WiFi channels nearby networks are using. Switch both 2.4 GHz and 5 GHz to the least congested channels.

    For 2.4 GHz, channels 1, 6, and 11 are the only non-overlapping channels. For 5 GHz, there are many more non-overlapping channels — choose one with no nearby networks.

  2. Enable Band Steering under Wireless > Band Steering. This encourages capable dual-band devices to connect to 5 GHz rather than 2.4 GHz.

    5 GHz is significantly faster but has shorter range. Band steering lets the router guide devices to the appropriate band based on signal strength.

  3. Enable AiMesh if you have multiple ASUS routers, or add a node. A single router covering a large home will have poor speeds at range — a mesh node dramatically improves throughput at distance.

  4. Check whether QoS is enabled and configured correctly. Go to Adaptive QoS and ensure the bandwidth allocation is not starving specific devices. If QoS is not needed, disabling it can improve throughput.

Frequently Asked Questions

My ASUS router shows WiFi 6 but my speeds are still slow — why?

WiFi 6 (802.11ax) requires a WiFi 6 adapter in the connecting device to benefit from the higher speeds. Older laptops, phones, and tablets with WiFi 5 or WiFi 4 adapters connect at their own maximum speed regardless of the router capability. Check the adapter specification in your device settings to confirm whether it supports WiFi 6.