Ethernet slower than Wi-Fi? Common causes and fixes

According to Engadget, many people expect wired Ethernet to be faster than Wi‑Fi, but in real use a wired connection can sometimes be slower than its wireless counterpart. Engadget lists a handful of hardware, software, and service reasons for the difference and walks through what to check.

Why ethernet slower than wifi happens

The piece begins by noting the basic expectation: Ethernet is typically faster than wireless, but strong wireless standards can outpace old wired setups. Engadget points out that modern routers and protocols can deliver very fast wireless throughput, and if your wired components are older or damaged, the wireless link may win out.

Old and low-quality cables limit speed

A basic cause is the cable itself. Ethernet standards have evolved, so not all cables support the same speeds. Engadget recommends using at least Cat5 or better and checking the small printed text on the cable sheath to see the category. Beyond category, some manufacturers use copper-clad aluminum, or CCA, which Engadget warns can degrade quickly and break. Reputable cables will list certification to TIE/EIA standards on the sheath.

Physical damage and port problems

Cable damage matters. Ethernet cables contain four twisted pairs, and a mis-twisted or damaged pair can reduce speed. The router or device port can also be the problem if internal contacts are worn or damaged. Engadget suggests simple tests: swap cables, try different router ports if available, or plug the cable into another device to see if the link changes. Look for a solid or blinking green light on the port, and no light can indicate a port or cable issue.

Driver, settings, and power-management issues

Software can throttle a wired connection. Engadget highlights outdated drivers for routers, ethernet adapters, or network cards as a frequent culprit, and notes this can show up after an operating system update. Check the aggregated link speed in Windows under Network and Internet settings, or the Network page on Apple devices, and compare the displayed link speed to your ISP plan.

Two specific settings Engadget calls out are useful to check: many systems use "Energy-Efficient Ethernet" by default, which you can turn off to test whether it affects speed, and Windows can disable a network adapter to save power through Power Management settings.

Malware, infected routers, and hidden traffic

Malicious software can sap bandwidth from a machine or even infect routers. Engadget describes how spyware, trojans, and worms can run background tasks that consume bandwidth, and notes that some malware has targeted routers directly. As an example, Engadget mentions VPNFilter, which in 2018 infected more than 500,000 routers and NAS devices worldwide and could steal data or render devices unusable. Regular scans with a reputable security tool are recommended.

ISP caps and service terms

Finally, Engadget points out that slow wired speeds can sometimes be a result of your service plan. ISPs may include speed or service caps, or promotional speeds that drop after a period. To separate ISP limits from local problems, Engadget recommends running side-by-side speed tests with the same device on wired and wireless links and then asking your ISP about any discrepancies.

Practical checks and fixes you can do right now

• Inspect the cable sheath and read the category printed on it, use Cat5 or better, and avoid CCA cables.
• Swap the cable and try different router or device ports to isolate a bad cable or port.
• Check the link speed shown in your OS (Windows Network and Internet settings, or the Network page on macOS) and compare it to your ISP plan.
• Update drivers for your router, ethernet adapter, and network card, and recheck after any OS updates.
• Turn off Energy-Efficient Ethernet and disable any adapter power-saving in the Power Management tab to see if speeds improve.
• Run a full malware scan on affected devices and reset or update router firmware if you suspect infection.
• Run wired and wireless speed tests, then ask your ISP about any unexpected differences or caps.

If you prefer, Engadget's article lists the same checks and background details for each cause, including the cable materials, port indicators, and the historical malware example.

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