LAN Network Slow speeds Solved

  1.    01 Mar 2016 #1

    LAN Network Slow speeds

    Currently have a WiFi network setup for internet. Both computers connect to the router via WiFi Dongles. Which is running no problems.

    Each computer is then plugged into a network switch (cheap 4 port stand alone unit) via Ethernet cables (gigabit ports) and into the switch I have also have a WD My Cloud.

    Having various issues, such as unidentified network, network being defaulted back to public, the ip addresses I have assigned being reset to obtain automatically and only getting transfer speeds of 3MB/s

    Running windows 10. No home group/work group setup, have 1 drive on the other computer shared and mapped as a network drive.

    Any help or suggestions would be greatly appreciated

      My ComputerSystem Spec

  2.    01 Mar 2016 #2

    update, problem fix with the following. Thanks 100MB/s on large files

    liqetsia911 said: View Post
    This seemed to work for me:

    Disabling “Large Send Offload (LSO)”

    Large Send Offload is a technique of improving network performance while at the same time reducing CPU overhead. Apparently it does not work very well, so it was suggested to disable it. If you would like to know about LSO, check this MSDN article from 2001 (Task Offload (NDIS 5.1) (Windows Drivers)).

    LSO is an option located in a Device Manager under your network adapter, so this solution requires Administrator Privileges.

    Follow these steps:
    1.Open Start Menu, right-click on Computer and select Properties
    2.Under Control Panel Home located on the left side of the window click on Device Manager
    3.You will get a list of all devices on your machine. Expand Network Adapters.
    4.Find your Network Card and double-click on it.
    5.Select Advanced tab. You will get a list filled with different options.
    6.Select Large Send Offload V2 (IPv4) and set the value to Disabled
    7.Do the same for Large Send Offload V2 (IPv6) if it is available
    8.Click OK

    After clicking OK, tried to send a file over the LAN network. Transfer speed started very slow, but it was gradually picking up speed. Decided to restart the computer and try to send that file again and this time it worked like a charm.

    Now that sending of files worked as it should, also checked speed for receiving files. It turned out that it was still slow but all that was needed to fix was to disable Large Send Offload V2 on the other computer. Once done, problem was solved for receiving files as well.

    Hope this works for you guys / girls
      My ComputerSystem Spec

  3. sml156's Avatar
    Posts : 674
    Microsoft Windows 10 Pro 64-bit
       01 Mar 2016 #3

    I have two Lan cards in my computer one is a 100MB and the other is 1 gig, On the 1 Gig Lan card that setting is disabled by default and on the 100 MB card it is enabled by default
      My ComputerSystem Spec

  4.    22 Jan 2017 #4

    This thread saved me! Got home LAN of a PC W10x64 via Ethernet and a laptop also W10x64 via wifi 2.4GHz. When copying from PC to laptop speed was 350-400Kb/s. Disabling LSO on the PC (with rebooting) made it 25Mb/s (bottlenecked by wifi). All drivers were up-to-date and W10x64 with latest updates on both machines. So, this LSO ("lower speed on" it is I guess) is really broken and shame on MS they has not fixed it since at least March 2016!!!
      My ComputerSystem Spec


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