Several factors can contribute to slow Wi-Fi speeds compared to Ethernet. Here are some common reasons:

1. Wireless Interference: Wi-Fi signals can be affected by interference from other electronic devices, neighboring Wi-Fi networks, or physical obstacles like walls and floors.

2. Distance from Router: The farther you are from the Wi-Fi router, the weaker the signal becomes, leading to reduced speeds.

3. Signal Obstructions: Physical obstructions such as walls, furniture, and appliances can absorb or block Wi-Fi signals, causing a decrease in speed.

4. Wi-Fi Channel Congestion: If there are many Wi-Fi networks in your vicinity using the same or overlapping channels, it can result in interference and reduced performance.

5. Network Overload: Too many devices connected to the Wi-Fi network simultaneously can lead to congestion and slower speeds, especially if the router cannot handle the traffic efficiently.

6. Router Issues: Outdated router firmware, hardware limitations, or an aging router may not be capable of delivering high-speed Wi-Fi.

7. Frequency Band: If you're using a 2.4GHz Wi-Fi band, it may experience more interference compared to the less crowded 5GHz band. Consider switching to the 5GHz band if your devices support it.

When troubleshooting slow Wi-Fi, you can try the following:

• Move closer to the router.

• Reduce interference by changing the Wi-Fi channel.

• Limit the number of connected devices.

• Update router firmware.

• Consider upgrading to a dual-band or tri-band router.

• Use Wi-Fi extenders or mesh systems to improve coverage.

If these steps don't resolve the issue, there may be a problem with your ISP or the router itself. It's also worth checking if there are any background applications or devices consuming bandwidth.