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Wi-Fi

Wi-Fi vs Ethernet: What We See When We Test Both

The speedtest.doctor team 8 min read

If your speed test looks great on paper but feels slow in the bedroom, the culprit is often Wi‑Fi — not the ISP. Ethernet and Wi‑Fi frequently diverge by 30–70% on throughput and by much more on latency spikes. Testing both the right way tells you where to spend effort.

Why Wi‑Fi and cable diverge

Ethernet is a dedicated copper (or fibre) path to your router. Wi‑Fi shares airtime with every device, negotiates lower rates with distance and walls, and retries lost frames. That shows up as lower Mbps, higher ping, and more jitter — especially on 2.4 GHz or crowded apartment blocks.

A fair A/B test at home

  1. Plug a laptop into the router with Ethernet. Run a speed test. Record download, upload, ping.
  2. Unplug and repeat on Wi‑Fi in the same room, then in your typical usage spot.
  3. Compare at the same time of day — not days apart.
  4. Note band (2.4 vs 5 vs 6 GHz) and distance. Mesh systems add an extra hop.

If wired is fine but wireless is weak only far from the router, placement or mesh backhaul is the fix — not a faster ISP plan.

Improvements that actually move numbers

  • Move the router central and elevated; avoid cupboards and metal desks.
  • Use 5 GHz or 6 GHz for laptops and TVs; reserve 2.4 GHz for IoT if needed.
  • Prefer wired backhaul between mesh nodes over wireless repeaters.
  • Update router firmware; disable legacy 802.11b rates if your admin UI allows.

FAQ

Is Wi‑Fi 6 always faster?
Only if your clients support it and congestion is the bottleneck. A weak signal on Wi‑Fi 6 can still lose to a strong Wi‑Fi 5 signal.