That 100 Mbps result doesn't automatically mean your Ethernet cable is bad. Here's how to narrow down the culprit.
You have gigabit internet and your wired-in PC is only getting 90 Mbps, so is that outdated Ethernet cable getting in the way? While running wired Ethernet connections avoids Wi-Fi interference and can lower latency, plugging in a cable doesn't automatically mean you'll get ultra-fast speeds. Even if your internet service is speedy, a slow Ethernet connection can slow down file transfers between computers at home.
Using an online speed test won't provide a definitive answer, as it measures more than just the cable. The first place to start is to check the Ethernet link speed, and you don't need to purchase a tester to do this.
On Windows 11, go to Settings > Network & internet > Ethernet and check the Link speed (Receive/Transmit) field. Another method involves a shortcut that also works on Windows 10: press Windows + R, type ncpa.cpl, right-click your Ethernet adapter and select Status. The negotiated connection rate is displayed in the Speed field.
On a Mac, open System Settings > Network > Ethernet (or your USB Ethernet adapter), then go to Details > Hardware and check the Speed field. Keep the configuration set to Automatic, as manually setting a speed may result in connection issues.
There's a difference between seeing 1 Gbps here and actually downloading at 1 Gbps. The figure describes the connection between your computer and the router or network switch .
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