Ethernet speed wont go above 100mbs while port speed is set to 2.5gbs (full duplex)

Kevin Hill 20 Reputation points
2026-08-25T18:54:51.19+00:00

Hi all!. The problem is I recently upgraded my internet speed to 1gbs but after doing speed tests, cant get speed to go above 100mbs on my Win11; on both wifi and hard line. Have older Optiplex system that runs 980mbs down on hard line and 460mbs via wifi. Used same hard line and same wifi channel so I know its not the router, switch, or cable. Adjusted port settings from auto nego to full duplex. Adjusted jumbo frames from minimum 1514 to maximum 90XX. Added throttle speed lines to registry. Nothing changes. Yes, all updates on software and drivers are done. I'm at a loss on what else to do/check. Open to ideas and help. Thanks!Fun11 - Ethernet port settings.jpg

Windows for home | Windows 11 | Internet and connectivity
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EmilyS726 265.1K Reputation points Independent Advisor
2026-08-25T19:41:15.3566667+00:00

Hello

I don't think I can straight up give you the solution, but I hope you don't mind me reviewing a few things first.

Can you launch powershell, and run this command: 

Get-NetAdapter | Select Name, Status, LinkSpeed

Then share a screenshot of the result please.

Next, Please type cmd in the search on the taskbar. Don't press enter key yet. Instead, choose "run as administrator" to launch Command Prompt. Then run this command 

netsh interface tcp show global

Share another screenshot please. Thanks!!

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  1. Bulldog 4,465 Reputation points
    2026-08-26T21:43:06.1933333+00:00

    As an FYI: Your port speed and your internet speed are separate, unrelated things. Your port speed measures the bandwidth your hardware is capable of handling. Your internet speed comes from your Internet Service Provider.

    Your port speed is something you consider if, for example, you share large files with other devices on your network.

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  2. Horace Wiggins 530 Reputation points
    2026-08-25T21:19:40.3833333+00:00

    Look at the Control Panel and your Ethernet Connection. What does that show? What is the make and model of the router you have? When you do a speed test what do you get?

    Example image of my Ethernet adapter.

    Example image ofUser's image

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