Businesses that rely on wired networks sometimes chase slow throughput by replacing Ethernet cables, but the source notes that a low speed-test result does not automatically mean the cable is bad. The first step is to check the negotiated link speed in the operating system, which shows the connection between the computer and the router or switch rather than the internet connection or the cable's true capability.
The article recommends verifying the hardware on both ends before buying replacements, since a 100 Mbps port on a router or a limited USB adapter will cap speeds regardless of cable quality. If both ports support gigabit, reseating connectors and swapping in a short, known-good cable can help isolate the problem. For a more rigorous test, iPerf3 measures real throughput between two wired computers without involving the ISP.
Although the piece is aimed at home users, the same diagnostic logic applies to small office setups: check settings first, confirm port specifications, and only then suspect the cable. The author notes that cable markings such as Cat5e and Cat6 are more informative than the connectors, and that certification testers are needed to verify full compliance with cabling standards.