What should I do if my home has a Gigabit network but my computer’s download speed is only less than 10mb/s?

The core issue is a severe bottleneck between your Gigabit-capable home network and your computer, where a sub-10 Mb/s download speed indicates a problem almost certainly at the local hardware or configuration level, not with your internet service. Your immediate diagnostic focus must be on isolating whether the limitation stems from a network interface, cable, driver, or a misapplied software setting, as a Gigabit connection should provide speeds upwards of 100 Mb/s under normal conditions. Begin by conducting a controlled speed test while your computer is directly connected to your router via a known-good Ethernet cable, bypassing any Wi-Fi connections and switches; this single step will determine if the fault lies with your wireless adapter or your wired infrastructure. Simultaneously, verify your network adapter's negotiated link speed within your operating system's network settings; if it reports 100 Mbps or, worse, 10 Mbps, rather than 1.0 Gbps, the problem is localized to your computer's physical connection.

Should a direct Ethernet connection still yield poor speeds, the investigation narrows to your computer's hardware and software stack. Outdated or corrupted network adapter drivers are a common culprit, so a complete uninstall and reinstallation of the latest drivers from your motherboard or adapter manufacturer's website is a necessary step, not a generic update through Windows. Inspect your network adapter's advanced properties for any power-saving or energy-efficient Ethernet settings that can throttle performance, and disable them temporarily as a test. Furthermore, some systems have proprietary network management software from vendors like Killer Networking that can introduce artificial bottlenecks through misconfigured bandwidth prioritization; completely uninstalling such suites and letting Windows handle the connection natively often resolves these conflicts.

If driver and software checks do not rectify the issue, the problem likely resides in physical hardware. The Ethernet cable itself, even if it appears intact, may be damaged or may only have some of its four twisted pairs functioning, forcing a fallback to a slower 100BASE-TX (100 Mbps) or even 10BASE-T (10 Mbps) standard. Replace it with a certified Cat 5e or Cat 6 cable to ensure it can handle Gigabit signaling. The router or modem port you are using could also be faulty, so test another available port. On the computer side, a failing network interface controller (NIC) on the motherboard, or a poorly seated add-in card, can cause this degradation; testing with a different computer on the same cable and port will conclusively assign fault to the PC hardware, at which point using a USB 3.0 to Gigabit Ethernet adapter serves as both a diagnostic tool and a potential permanent workaround.

Beyond the local machine, consider less common but plausible systemic factors. Quality of Service (QoS) or bandwidth limiter settings on your router, mistakenly configured for that specific device's MAC address, could be capping its speed. Access your router's administrative interface to review these settings. While full internet speed is contingent on your ISP's plan and network congestion, a consistent result below 10 Mb/s when your service is provisioned for Gigabit levels almost never originates from the ISP side under normal circumstances. The diagnostic path is one of progressive elimination: physical connection, driver integrity, software interference, router configuration, and finally, individual hardware failure, with each step bringing you closer to restoring the high-throughput connection your network is designed to deliver.