Why is Wi-Fi Slower than Ethernet?

In the video, the host explains why Wi-Fi usually feels slower than a wired Ethernet connection, even when you have a fast internet plan. The explanation starts with the fundamental difference between radios in free air versus a dedicated copper path inside a cable. While fiber or copper cables can carry a consistent signal over relatively long distances without much deterioration, wireless signals in a home environment contend with walls, other devices, and various sources of interference such as microwaves and neighboring networks. This interference leads to shared spectrum and contention for airtime, meaning multiple devices often end up competing for the same channel. As a result, there is inherent overhead in Wi-Fi to avoid collisions, which translates into added latency. The host contrasts this with Ethernet, where each device typically has a dedicated path to the router, reducing conflicts and enabling near full-duplex communication on a single wire pair, thereby achieving lower latency and more predictable performance. The discussion then shifts to how Wi-Fi protocols delay transmissions to minimize collisions, and how full duplex wireless is still experimental, whereas Ethernet has long operated in full duplex. The takeaway is that, all other factors being equal, a wired connection will usually deliver more consistent and sometimes higher performance than Wi-Fi, particularly in noisy environments or when many devices share the same radio channel. The host closes with a plug for FreshBooks, but the core message remains that for speed and reliability, wired connections generally outperform wireless in practical home and small-office setups.

Topics · technology · networks · science & technology