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Windows Network Throttling

Anonymous
2022-05-11T19:38:12+00:00

So, I have a weird issue and I have exhausted everything I can find/do to resolve this issue. It appears that something in Windows is throttling network speeds at one of my client sites. Client has gig fiber. Below are things I have tried:

  1. Disabled Windows Auto-Tuning
  2. Disabled Large Offsend
  3. Turned off delivery optimization
  4. Verified the Switch is set to Auto Negotiation and is able to negotiate at gig speeds
  5. Tried Connecting Dell and Lenovo (Windows) laptops directly to switch port and get roughly 400 MB down
  6. Tried using gig USB-C adapter
  7. Connected Linux and MacBook to same port, directly to the switch, got roughly 900 down

Because Linux and Mac seem to have no issues negotiating the correct speeds, this tells me that it is something in Windows. This client does not have servers, it is all local users (Non-AzureAD), and roughly only 10 users.

Any help is appreciated.

Windows for home | Windows 10 | Internet and connectivity

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  1. Anonymous
    2022-05-11T19:57:40+00:00

    Really? Then how does it control Speed and Duplex on the NIC?

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  2. Anonymous
    2022-05-11T20:14:54+00:00

    Really? Then how does it control Speed and Duplex on the NIC?

    Speed and duplex are features of the NIC. They are not features of Windows.

    Most of today's NICs offer 100 Mbps or 1000 Mbps. Can you select any other speed, say 400 Mbps or 600 Mbps?

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  3. Anonymous
    2022-05-11T19:49:32+00:00

    Windows can't throttle a network, because it's not part of the network. The LAN begins at the router and ends at the point where the network adapter connects to the motherboard. By the time Windows sees the bits, they are off the network. The most that Windows can do is to communicate with the network hardware. Sorry, but this problem is all about your client's LAN, which doesn't run Windows.

    There are so many things that can interfere with a LAN, too many to list: cross-channel interference, physical interference, incompatible hardware mix, mixing hardware standards, internet exploits, router settings, the speed of the slowest network device, incorrect commands incorrect Windows settings, etc. Someone has to be at the client site to examine their setup.

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