Wi-Fi vs. Ethernet

Why the connection type matters

Wi-Fi is convenient — no cables, works from anywhere in range — but every device on the same network shares the same airtime. When multiple phones, laptops, and smart-home devices are active at once, they take turns transmitting, and radio interference from neighboring networks and household electronics can further degrade the signal. Ethernet gives each device its own dedicated wired path to the router, so it isn't competing for airtime or affected by walls and radio noise. That generally makes Ethernet faster and, just as importantly, far more consistent — latency and jitter stay low and predictable, which matters for gaming and video calls even more than peak download speed does.

Signal strength and distance

Wi-Fi signal strength drops with distance from the router, and it drops faster when the signal has to pass through obstacles. Walls, floors, and ceilings — especially concrete, brick, or anything with metal studs or wiring inside — absorb and reflect radio waves. A device two rooms away or on a different floor from the router can see a fraction of the throughput it would get standing next to it, even though nothing about your internet plan has changed.

Interference

Wi-Fi shares unlicensed radio spectrum, so it's subject to interference from sources you don't control. Neighboring Wi-Fi networks on the same or overlapping channels compete for the same airtime, which is common in apartment buildings and dense neighborhoods. On the 2.4GHz band specifically, everyday household devices — microwaves, cordless phones, baby monitors, and some Bluetooth devices — operate in or near the same frequency range and can cause noticeable slowdowns or dropped packets while they're active.

2.4GHz vs. 5GHz vs. 6GHz

Most modern routers broadcast on more than one band, and the right choice depends on where you are relative to the router:

• 2.4GHz travels further and penetrates walls better, but it's more congested — more devices and more neighboring networks use it — and its maximum speed is much lower than the other bands.
• 5GHz offers substantially higher speeds and less interference, at the cost of shorter range and more sensitivity to walls and obstacles.
• 6GHz (available on Wi-Fi 6E and Wi-Fi 7 devices) is the newest band, with the least congestion and the highest potential speeds, but the shortest range of the three.

As a practical rule, use 5GHz or 6GHz when you're in the same room as or close to the router, and fall back to 2.4GHz for devices further away or with a weak signal on the faster bands.

Router placement

Where you put the router has a real effect on the Wi-Fi speed you actually get. Place it in a central, open location rather than a corner or closet, and elevate it — on a shelf rather than the floor — since signal spreads outward and downward from the antennas. Keep it away from thick or dense walls, metal objects (including large appliances and metal furniture), and other electronics that can add interference, such as microwaves and cordless phone base stations.

Ethernet cable and port limitations

Plugging in doesn't automatically remove every bottleneck. Older Cat5 cable and the original 10/100 Ethernet standard cap out at 100 Mbps, which is well below what many current internet plans deliver — so a fast plan can still look slow over an old cable or an old router port. If your wired speed seems capped, check that you're using Cat5e or Cat6 cable and that the port on your router or switch is a gigabit (1000 Mbps) port rather than a legacy 100 Mbps one.

Device network-adapter limitations

The device itself can also be the limiting factor. An older laptop, phone, or smart TV may have a Wi-Fi chipset or Ethernet adapter that doesn't support your router's fastest band or standard — for example, a device that only supports Wi-Fi 5 can't take advantage of a Wi-Fi 6E or 6GHz network no matter how fast your plan is. In that case the connection is capped by the device's hardware, not your ISP, your router, or your cabling.

Compare Wi-Fi and Ethernet yourself

The clearest way to see how much Wi-Fi is costing you is to run a speed test on the same device over Wi-Fi, then again over a wired Ethernet connection, and compare the results. A large gap points to signal strength, interference, or band choice as the culprit; a small gap over both means your connection is close to your plan's real limit. For more on what to check next, see our guides on why your internet might be slow and ping, jitter, and loaded latency, or read our testing methodology.