---
title: "Wi-Fi slow but Ethernet fast? Find the wireless bottleneck · Kilobat Guides"
url: "https://kilobat.app/guides/wifi-slow-ethernet-fast"
description: "Compare Wi-Fi beside the router, Wi-Fi in the problem room and Ethernet to identify coverage, device and mesh problems before buying equipment."
---

# Wi-Fi slow but Ethernet fast? Find the wireless bottleneck

If the same device is consistently faster on Ethernet, investigate the wireless path first. Three matched tests are more useful than a single speed-test screenshot.

Applies to: Home internet on Windows, macOS, phones and tablets. No Kilobat account or app required. · Checked: 3 November 2026

## When this helps

- Downloads work beside the router but crawl in another room.
- Ethernet is fast while video calls on Wi-Fi freeze.

## Compare three places on the same device

1. Run a wired test through a router LAN port, with Wi-Fi disabled.
2. Disconnect Ethernet and test on Wi-Fi beside the router.
3. Repeat in the room where the problem happens, using the same server.
4. Repeat the sequence while other household traffic is quiet.

## Read the pattern

| Wired | Wi-Fi by router | Wi-Fi in room | Next check |
|---|---|---|---|
| Fast | Fast | Slow | Coverage, walls or mesh placement |
| Fast | Slow | Slow | Wireless band, interference or client capability |
| Slow | Slow | Slow | Line, router, test server or household demand |

## Change one thing and retest

A mesh satellite needs a good connection back to the router. Placing it inside the dead spot can preserve the bottleneck.

Use the [router guides](https://kilobat.app/routers) for the exact menus. Keep the old settings so you can reverse a change.

1. Move the router into an open position away from thick walls and metal obstructions.
2. Compare another device in the same location. A device-specific difference narrows the search.
3. If using mesh, test near the main router and a satellite separately.
4. Check your router maker’s band and channel guidance before changing settings.

## Will a faster internet plan help?

A faster plan cannot repair a weak wireless link. First establish whether wired performance already meets your needs.

A speed test uses real data. Keep repeated testing modest on a metered or mobile connection.

## Still stuck?

You can ask for help at [ping@kilobat.app](https://kilobat.app/internet-problems#ask). Send your symptoms and reviewed test results, with or without Kilobat.

## Sources

- [Ofcom: broadband faults, minimum speeds and complaints](https://www.ofcom.org.uk/phones-and-broadband/service-quality/broadband-wifi-help)
- [Cloudflare: what a speed test measures](https://speed.cloudflare.com/about/)

Checked on 3 November 2026.

## Related guides

- [Internet slower than advertised? Test it before you complain](https://kilobat.app/guides/internet-slower-than-advertised): A low speed test is a starting point.
- [Why is my internet slow at night but fast in the morning?](https://kilobat.app/guides/internet-slow-at-night): An evening pattern is useful evidence, but it does not identify the cause by itself.
- [Wi-Fi is slow on the Mac but fast on the phone](https://kilobat.app/guides/slow-wifi-mac-fast-phone): When the phone is fast on the same network, the internet connection is not the problem.