Ethernet vs Wi‑Fi: Speed, Latency and Which to Use (2026)

"Is Ethernet better than Wi‑Fi?" The short answer is yes for stability and usually yes for speed — but the gap depends on your Wi‑Fi generation, distance from the router and what you are doing. Here is how the two really compare and where a cable actually makes a difference.

Ethernet vs Wi‑Fi at a glance

Speed: closer than you think — up close

Your internet plan is the real ceiling. On a 100 or 300 Mbit/s plan, a good Wi‑Fi 5 or Wi‑Fi 6 connection in the same room as the router will usually deliver the full speed, so a cable gains nothing in a speed test. On gigabit and faster plans, Ethernet reliably gives you ~940 Mbit/s, while Wi‑Fi typically lands lower unless you are close to a Wi‑Fi 6E or Wi‑Fi 7 router.

Distance changes everything. Every wall and floor costs Wi‑Fi speed, and the 2.4 GHz band is much slower than 5 or 6 GHz (see 2.4 GHz vs 5 GHz). A cable delivers the same speed at 1 metre or 50 metres (Ethernet runs up to 100 m per segment).

Check the hardware too: a cable plugged into a 100 Mbit/s port, or an old Cat5 cable with a damaged wire, caps you at about 94 Mbit/s. Use Cat5e or better for gigabit, Cat6/6a for 2.5–10 GbE.

Latency and stability: where Ethernet really wins

For gaming, video calls and cloud gaming, consistency matters more than raw bandwidth. Wi‑Fi shares the air with every other device and neighbouring network, retransmits lost packets and occasionally pauses while it scans or changes channel. The result is jitter — ping that jumps from 15 ms to 80 ms — and the "lag spikes" gamers complain about. A cable avoids all of this: latency to the router stays under a millisecond and doesn't jump.

That doesn't mean Wi‑Fi is unplayable. A modern router a room away often gives perfectly playable ping. But if you see rubber-banding, voice cut-outs or cloud gaming stutter, plugging in a cable is the single most effective fix.

Which devices should use Ethernet

• Gaming PCs and consoles — lowest ping, no spikes, faster game downloads.
• Smart TVs and streaming boxes — fewer buffering drops on 4K HDR streams. Note many TVs only have a 100 Mbit/s port, still plenty for 4K (about 25 Mbit/s).
• Desktop PCs and home-office setups — stable video calls and large uploads.
• NAS, home server, Home Assistant box — always-on devices benefit most.
• Mesh nodes — a wired backhaul between nodes restores full speed (see our mesh Wi‑Fi buying guide).

Phones, tablets, laptops on the move, smart speakers and most smart-home devices are best left on Wi‑Fi or Thread.

Can't run a cable? Your options

• Flat or under-carpet Ethernet cable along skirting boards — cheap and still full speed.
• Powerline adapters use your electrical wiring. Real speeds are often 100–500 Mbit/s and depend heavily on wiring quality, but latency is usually steadier than weak Wi‑Fi.
• MoCA adapters use existing TV coax and can give near-gigabit with low latency.
• Mesh with wired or dedicated wireless backhaul, or a Wi‑Fi access point placed in the room that needs coverage. Compare options in Wi‑Fi extender vs mesh.
• Better Wi‑Fi first: move the router (see where to put your Wi‑Fi router), use 5 GHz and update firmware.

How to test which is better in your home

Run a speed test twice from the same device: once on the cable next to the router, once on Wi‑Fi where you normally sit. Compare download, upload and especially ping and jitter (many speed-test apps show "loaded latency"). If Wi‑Fi gets 80–90% of the wired result with stable ping, you don't need a cable. If ping jumps or speed halves, wire that device or improve coverage. If both are slow, the problem is your line — see why is my Wi‑Fi so slow.