Right-click the network adapter that you want to change and select Properties. Why do I have speed or. Does the NIC indicate a 1G/2. 5G connection? There's your problem. tried to swap cables with the second pc and. Sometimes I unplug the cabble from my computer and plugs it into a laptop, it makes the router recognize the laptop accepts more speed and unlock the 1Gb speeed. but after using the computer for like 2-3. Windows 11, the latest operating system from Microsoft, provides several options for tweaking your network settings, including altering the link speed of your network adapter. In. If you are only getting exactly 10mbps, or exactly 100mbps down via ethernet on gigabit fiber, checking the configuration on your computers network adapter is a good start. Windows Control Panel > Network and Sharing Center > Change adapter. Used to get 42Mbps on all devices at home. Apart from ONE PC which is showing about 40Mbps still. This setting can impact both performance and power consumption. Receive Buffers (256 or 512): Receive buffers manage incoming.