How to Accurately Compare Wi-Fi and Ethernet Speed

Understanding the Difference: Internet vs. Wi-Fi Speed

Your internet plan is an advertised service tier, while a browser speed test estimates one device-to-endpoint path at one moment. The device, local link, router or gateway, provider network, route, and selected endpoint all remain part of the result.

Wi-Fi adds a shared radio path affected by signal, interference, channel use, and client capability. Ethernet removes those radio conditions, but its adapter, cable, negotiated link rate, and router port can still be the bottleneck. Neither label guarantees the faster result.

How to Build a Controlled Ethernet Baseline

Ethernet is useful because it removes Wi-Fi from the local path. It does not bypass the test device, adapter, cable, router or gateway, provider route, or hosted endpoint. See the published methodology for what SwiftSpeedTest does and does not measure.

1. Check the wired path: Use a device, adapter, cable, and router LAN port rated for the plan, then record the negotiated link rate.
2. Connect to the router or gateway: Use a LAN port. Connect directly to a standalone modem only when the ISP documents and permits that procedure; do not bypass managed security controls.
3. Minimize Other Usage: Ensure no other devices are heavily using the internet during the test. Close unnecessary applications on the testing computer.
4. Run repeatable tests: Use SwiftSpeedTest.com, keep the endpoint fixed, and collect more than one sample.
5. Record the baseline: Save download, upload, idle and loaded responsiveness, jitter, warnings, endpoint, time, and wired link rate. Use this as a comparison baseline, not a certified ISP-delivery measurement.

How to Test Your Wi-Fi Speed

Now measure the wireless path people actually use. It may be lower or higher than the wired baseline when the radio, wired adapter, cable, or port has a different limit.

1. Disconnect Ethernet: Unplug the Ethernet cable if you just tested with it.
2. Connect to Wi-Fi: Confirm the intended network and band. If the device and router support more than one band, compare them under matched conditions instead of assuming one always wins.
3. Position Your Device:
   • First, test relatively close to the router to establish a low-obstruction radio baseline.
   • Then, test from locations where you commonly use Wi-Fi (e.g., living room, bedroom, office) to see how speed drops off with distance and obstructions.
4. Minimize Other Usage: As before, ensure minimal network activity from other devices.
5. Run the Test: Use SwiftSpeedTest.com on the Wi-Fi connected device.
6. Compare Results: Compare download, upload, idle and loaded responsiveness, jitter, warnings, and endpoint with the Ethernet baseline. Repeat the same room test before and after each change.

Common Factors Affecting Wi-Fi Speed

If your Wi-Fi speeds are much lower than your Ethernet speeds, consider these common culprits:

• Distance from Router: Signal strength weakens rapidly with distance.
• Obstructions: Walls (especially brick/concrete), floors, large appliances, metal objects block or reflect signals.
• Interference: Other Wi-Fi networks (neighbors), Bluetooth devices, microwaves, cordless phones can interfere, especially on the crowded 2.4GHz band.
• Router Capabilities: Radio generation, channel width, antennas, processing, and wired port rates can limit a path. A newer standard label alone does not prove the upgrade will improve your measured workload.
• Device Capabilities: Your phone, laptop, or tablet also needs to support modern Wi-Fi standards to benefit from a faster router.
• Network Congestion (Wi-Fi): Too many devices connected and actively using the same Wi-Fi network can slow it down.

Improving these often involves steps outlined in our 10 Ways to Fix Slow Internet guide, like router placement, changing bands/channels, or upgrading hardware.