Wi-Fi vs Ethernet: Is a Cable Really Faster?
Quick answer
Usually, yes. A cable delivers close to your full plan speed with low, steady ping. Wi-Fi can be just as fast right next to a modern router, but drops with distance, walls and interference, and adds jitter. For gaming, calls and work PCs, a cable is worth it.
The differences
| Feature | Ethernet | Wi-Fi |
|---|---|---|
| Speed | Full line speed (gigabit ports ≈ 940 Mbps in practice) | Varies with distance, walls, device |
| Ping | Lowest | A few ms higher |
| Jitter | Very low | Higher, can spike |
| Affected by neighbours | No | Yes, on crowded channels |
| Convenience | Needs a cable | Anywhere in range |
Why a cable is more consistent
An Ethernet cable is a private, shielded path between your device and the router. Nothing else uses it, and walls don't get in the way. Wi-Fi is shared radio: every device on your network takes turns to talk, neighbours' networks on the same channel compete for the same airtime, and the signal weakens with every wall and floor. When the air is busy, devices wait and retry, which shows up as lower speed and, above all, as jitter — ping that jumps from one moment to the next.
For browsing and streaming, those small delays are hidden by buffering. For games and video calls, which need data to arrive on time, they're noticeable: a frozen frame, a robotic voice, a shot that didn't register.
When Wi-Fi is good enough
For phones, tablets, laptops on the sofa and streaming in the same room as the router, modern Wi-Fi (Wi-Fi 5, 6 or 7) is plenty fast. A recent laptop a few metres from a Wi-Fi 6 router can match or come close to a gigabit cable. The gap grows with distance and floors, and with how many devices are active at once.
Wi-Fi has improved a lot. The 5 GHz and 6 GHz bands are faster and far less crowded than 2.4 GHz — see 2.4 vs 5 vs 6 GHz — and mesh systems now give strong signal across whole homes.
When to use a cable
- Gaming consoles and gaming PCs — lower, steadier ping matters more than speed. See how to reduce ping.
- A work computer used for video calls — fewer freezes and dropouts.
- TVs far from the router that buffer — especially for 4K.
- Large uploads and backups — upload suffers more on Wi-Fi than download does.
- Testing your real line speed — a cable test removes Wi-Fi from the result.
What to check on the cable side
A cable only helps if every part of the path is up to the job:
- Cable: Cat5e or better for gigabit. Very old, kinked or damaged cables can drop to 100 Mbps.
- Ports: both the router and the device need gigabit ports (or faster) for plans above 100 Mbps.
- Adapters: USB Ethernet adapters vary; some older ones are limited to 100 Mbps.
If a wired test shows almost exactly 94 Mbps, a port or cable is probably running at 100 Mbps instead of 1 Gbps.
Will newer Wi-Fi close the gap?
Each Wi-Fi generation narrows it. Wi-Fi 6 handles many devices at once far better than older standards, and Wi-Fi 7 adds wider channels and the ability to use two bands at the same time, which helps both speed and steadiness. Close to a modern router, with a modern device, the difference in speed can disappear.
What newer Wi-Fi can't change is physics: walls still weaken the signal, and radio is still shared with every other device and network nearby. For a device that never moves and where every millisecond counts, a cable remains the simplest way to get the best result.
Can't run a cable?
Long cables along skirting boards aren't for everyone. Alternatives:
- Powerline adapters send network data over your home's electrical wiring. Results depend on the wiring, so test them.
- Mesh systems with a wired or dedicated wireless backhaul extend fast Wi-Fi, and many units have Ethernet ports for nearby devices. See mesh Wi-Fi vs extenders.
- Move the router closer to the devices that matter. See router placement.
Compare yourself
Run the Wi-Fi speed test where you sit, then plug in a cable and run it again. The difference is what your Wi-Fi costs you. Check the ping and jitter numbers too, not just the speed.