A slow Ethernet connection on a laptop can come from the cable, a router port, the laptop’s adapter or driver, or the internet service itself. First compare the laptop with another device on the same network, then check the Ethernet link rate and swap one connection component at a time. That separates a slow local link from slow internet service and helps pinpoint what to fix.
Is the Ethernet link slow, or is the internet slow?
Ethernet link speed is the negotiated rate between the laptop’s network adapter and the router or switch. An internet speed test measures data traveling beyond that local connection, and its result can also be affected by the internet plan, network congestion, or activity on other devices. A link showing 100 Mbps does not by itself prove the ISP is the bottleneck, and a gigabit link does not guarantee gigabit internet speeds.
Compare the laptop with another device
- Run a speed test on the laptop and on another device connected to the same network. Use the same testing service and test close together in time.
- If both devices are slow, look at the router, modem, ISP service, or broader network conditions before changing the laptop’s settings.
- If only the laptop is slow, continue with cable, router port, adapter, and driver checks. Microsoft also recommends comparing another PC when troubleshooting a slow connection: Microsoft’s Ethernet troubleshooting guide.
How to check Ethernet speed on Windows and Mac
Check the reported Ethernet link rate before assuming the internet connection is the problem. The exact location of network details can vary by operating-system version and adapter.
Windows
Open the Ethernet adapter’s status and look for its link speed. If the status reports 100 Mbps but the laptop, cable, and router port are expected to support gigabit, investigate those components and their connection. Microsoft’s troubleshooting guide covers Windows 10 and Windows 11; Windows 10 support ended on October 14, 2025.
#1 Best Overall
- USB-C Meets 1000Mbps Ethernet in Seconds：UGREEN usb c to ethernet adapter supports fast speeds up to 1000Mbps and is backward compatible with 100/10Mbps network. Perfect for work, gaming, streaming, or downloading with a stable, reliable wired connection
- Extend a Ethernet Port for Your Device：This ethernet to usb c adds a Gigabit RJ45 port to your device. It’s the perfect solution for new laptops without built-in Ethernet, devices with damaged LAN ports, or when WiFi is unavailable or unstable
- Plug and Play: This Ethernet adapter is driver-free for Windows 11/10/8.1/8, macOS, Chrome OS, and Android. Drivers are required for Windows XP/7/Vista and Linux, and can be easily installed using our instructions. LED indicator shows status at a glance
- Small Adapter, Big Attention to Detail: The usb c to ethernet features a durable aluminum alloy case for faster heat dissipation than plastic. Its reinforced cable tail and wear-resistant port ensure long-lasting durability. Compact size and easy to carry
- Widely Compatible: The usbc to ethernet adapter is compatible with most laptops, tablets, smartphones, Nintendo Switch, and Steam Deck with USB-C or Thunderbolt 4/3 port, like MacBook Pro/Air, XPS, iPhone 17/16/15 Pro/Pro Max, Mac Mini, Chromebook, iPad
Mac
Check the Ethernet hardware details in macOS. The precise navigation varies by macOS version and Mac model. Apple documents connecting a Mac by Ethernet and using a USB-to-Ethernet or Thunderbolt-to-Gigabit-Ethernet adapter when there is no built-in Ethernet port: Connect your Mac to the internet using Ethernet.
Why is Ethernet stuck at 100 Mbps?
A 100 Mbps reading means the laptop and the connected router or switch port have negotiated a 100 Mbps local link. A cable or connector problem, an incompatible or slower port, or adapter settings can prevent the expected higher rate. Check each part of the path; do not assume the laptop itself is faulty.
Rank #2
- The Anker Advantage: Join the 65 million+ powered by our leading technology.
- Instant Internet: Connect to the internet instantly from virtually any USB-C 3.0 device, and enjoy stable connection speeds of up to 1 Gbps.
- Lightweight and Compact: The space-saving and portable design measures just over half an inch thick and weighs about the same as a AA battery.
- Premium Build: Features a sleek aluminum exterior and braided-nylon cable to complement the design of high-end devices.
- What You Get: PowerExpand USB-C to Gigabit Ethernet Adapter, welcome guide, 18-month worry-free warranty, and friendly customer service.
Reseat the cable and try another LAN port
- Make sure the Ethernet cable is firmly seated at both ends.
- Connect it to a router LAN port, not the internet/WAN port.
- Try another LAN port, since the port in use may not support the desired rate or may be faulty.
- Substitute a known-good cable. If the link rate changes, the original cable or its connectors may be the cause.
Microsoft recommends trying a second cable, and Intel likewise advises testing with a known-working cable when diagnosing a gigabit link. Intel’s gigabit troubleshooting guidance specifies Cat 6 or better for its case; that is not a promise that buying a higher-category cable will fix every slow connection.
Confirm both ends support the desired speed
A gigabit connection requires gigabit capability in the laptop’s Ethernet interface and the router or switch port, as well as a suitable, working cable. Intel’s guidance is specific to Intel adapters on Windows 10 64-bit, so treat it as vendor advice for that configuration rather than a universal instruction for every network device. Intel states: “Gigabit recommended setting is Auto-negotiation.” Its support article was last reviewed November 28, 2022: Intel’s gigabit Ethernet troubleshooting guidance.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
Rank #3
- 【Reliable & Endurance Connectivity】Designed specifically for plug-and-play connection between USB-C devices and wired network, provides gigabit ethernet connectivity even when wireless connectivity is Inconsistent or over extended.
- 【Surfing at Full Speed】Obtain stable connection speeds up to 1Gbps; downward compatible with 100Mbps/10Mbps networks. Our Type-C to LAN Gigabit Ethernet (RJ45) Network Adapter supports large downloads at maximum speeds without interruption.✅ To reach 1Gbps, make sure to use CAT6 & up Ethernet cables.
- 【Compact & Friendly Design】Compact and lightweight, with a user-friendly non-slip design for easier plug and unplug. Braided nylon cable for extra durability. Premium aluminum casing for better heat insulation. Fits snugly with the USB-C ports on your devices, better signal transfer protection.
- 【Wide Compatibility】Compatible with iPhone 15 Series, MacBook Pro 16''/15” (2023/2022/2021/2020/2019/2018/2017), MacBook (2019/2018/2017), MacBook Air 13” (2022/2018), iPad Pro (2022/2020/2018); XPS 13/15/17; Surface Book 2; Google Pixelbook, Chromebook, Pixel, Pixel 2; Asus ZenBook. Compatible with Samsung S20/S10/S9/S8/S8+, Note 8/9, Galaxy Tablet Tab A 10.5, and many other USB-C laptops, tablets, and smartphones. (NOT compatible with Nintendo Switch.)
- 【18 MONTH WARRANTY】: Exclusive BENFEI Unconditional 18-month Warranty ensures long-time satisfaction of your purchase; Friendly and easy-to-reach customer service to solve your problems timely
Restore automatic negotiation if settings were changed
Auto-negotiation should generally be enabled at both ends of the link. Avoid forcing speed or duplex as a routine first fix: mismatched settings can disrupt the connection. If you changed advanced adapter settings, restore the default or automatic setting unless your network administrator has specified a different configuration.
Check the cable, adapter, and laptop hardware
Once you have compared devices and checked the router port, use a known-good cable or adapter to see whether the problem follows a particular component. If the connection remains slow only on the laptop, inspect its Ethernet port or adapter and consider whether a software or hardware issue is plausible. Dell recommends checking the laptop’s Ethernet port and cable for physical damage in its troubleshooting guidance: Dell’s Ethernet connection troubleshooting guide.
Rank #4
- The Anker Advantage: Join the 65 million+ powered by our leading technology.
- Massive Expansion: Equipped with a Power Delivery input port, an HDMI port, an Ethernet port, a USB-C data port, and 2 USB data ports.
- Powerful Pass-Through Charging: Connect a 65W wall charger to the Power Delivery input port to provide high-speed pass-through charging to your laptop.
- Media Display: The HDMI port allows you to connect to an external display in resolutions up to 4K@30Hz.
- What You Get: PowerExpand 6-in-1 USB-C PD Ethernet Hub, welcome guide, our worry-free 18-month warranty, and great customer service.
Use the laptop maker’s driver for the exact model
If the issue began after an update or Windows reports an adapter problem, check the laptop manufacturer’s support page for an Ethernet driver that matches the exact laptop model and operating system. A driver reinstall or update is not a guaranteed speed fix: a cable, port, router, ISP, or background network activity may be responsible instead.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to use if the laptop has no Ethernet jack
A compatible USB-to-Ethernet adapter is a practical way to add a wired connection. Some Macs can also use a Thunderbolt-to-Gigabit-Ethernet adapter. Match the adapter’s connector and rated interface to the laptop’s port and operating system, and make sure the network port supports the rate you want. An adapter cannot make a slower router port or internet plan faster.
Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsQuick Recap
Best Value
- Adapter for converting a USB 3.1 Type-C port to a RJ45 Gigabit Ethernet port
- Integrated Ethernet port supports 10M/100M/1000M bandwidth; offers instant Internet connection to the host
- USB-C input allows for reversible plugging; offers complete compatibility with current computers and devices; compatible with Nintendo Switch
- Ready to use, right out of the box; no external power adapter needed
- Slim, compact size and lightweight aluminum housing for easy portability
Choose what to test or replace
| Option | What to check | What a substitution can tell you |
|---|---|---|
| Ethernet cable | Whether it is firmly connected, suitable for the target link rate, and in working condition. | If a known-good cable changes the negotiated rate, the original cable or connector may be at fault. |
| Router or switch LAN port | Whether the port supports the desired link rate and is functioning. | If another LAN port changes the result, the original port may be the issue. |
| Built-in laptop port or adapter | Whether it supports the desired rate and is compatible with the network device. | If the problem follows the laptop across known-good cables and ports, investigate its adapter, driver, or hardware. |
| USB or Thunderbolt Ethernet adapter | Whether its connector, operating-system compatibility, and rated interface suit the laptop and network. | A compatible adapter can add Ethernet to a laptop without a jack; it cannot raise the capability of the router port or internet plan. |
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
