Wi-Fi is convenient and, on modern equipment, genuinely fast. But if you have ever wondered whether running a cable would help, the short answer is yes, and the reasons go beyond raw speed.
Where the gap comes from
An Ethernet cable is a private, shielded, point-to-point link. Wi-Fi is a radio broadcast shared with every other device on your network, competing with your neighbours on the same channels, and weakened by every wall it passes through. That difference shows up in three ways.
Speed
Close to a modern router, good Wi-Fi can approach cable speeds. Move two rooms away and it is common to keep only half of your plan speed, sometimes far less. A cable holds its full rate regardless of where the room is.
Consistency
This is the underrated one. Wi-Fi throughput fluctuates constantly as devices join, interference comes and goes, and signal strength shifts. A cable delivers the same rate minute after minute. For anything real-time, steadiness beats peak speed.
Latency and jitter
Wireless adds a small amount of delay and, more importantly, variability. Ethernet typically shows lower ping and jitter close to zero. If you game competitively or live on video calls, this is the strongest argument for a cable. See our guide to what ping and jitter mean.
Which devices deserve a cable
You do not need to wire the whole house. Prioritise devices that are stationary and demanding:
- Desktop computers and work machines. They never move, and calls and file transfers benefit immediately.
- Games consoles and gaming PCs. The latency improvement is the point.
- Smart TVs and streaming boxes. 4K streams are steadier on a cable, and TVs often have poor wireless aerials.
- Network storage. Large local transfers are transformed.
Phones, tablets, and laptops you carry around are exactly what Wi-Fi is for. Freeing up airtime by wiring the stationary devices also makes Wi-Fi better for everything that remains on it.
When Wi-Fi is genuinely enough
If your plan is modest, your router is recent, and you are testing in the same room as it, Wi-Fi may already deliver essentially all of your line speed. In that case the cable will not raise your speed test result. Though it will still improve consistency and latency. Run our speed test twice, once on Wi-Fi and once on a cable, and you will see your own gap rather than a general estimate.
Practical notes on cabling
Cat 5e handles gigabit speeds and is fine for almost every home; Cat 6 is inexpensive and future-proofs you. Flat cables run neatly under carpets and along skirting boards. If a direct run is impossible, a wired access point in the distant room beats a wireless repeater, which halves bandwidth by design.
Frequently asked questions
Will a cable increase my plan speed?
No. It removes a bottleneck rather than adding capacity. If Wi-Fi was already delivering your full plan, the cable changes stability, not the headline number.
Does cable length matter?
Not at household distances. Ethernet is specified to 100 metres.
What about powerline adapters?
They send data over your mains wiring and sit between Wi-Fi and Ethernet in performance. Results vary enormously with the age and layout of your wiring, so treat them as a fallback where a real cable is impossible.
