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LAN file sharing too slow

Anonymous
2022-10-23T17:58:01+00:00

The problem is very old (i found reports from 10+ years), with hundreds of "copypaste" and generic anwers from microsoft over several websites and this forum, why no one ever cared enough to fix this, or at least tried to look into it?!?!

Comparing a large file (20GB) transfer:
Internet download speed: 200-250MB/s (from remote server, web, torrent, whatever)

FTP speed: 200-250MB/s (filezilla server+client)
Windows explorer transfer speed: 5-10MB/s

This doesnt make any sense, if the network is capable of handling faster speed, why windows isn't taking advantage of it.

Changing settings such as:

  • Turn Off "Remote Differential Compression"
  • Disable "TCP Auto-Tuning"
  • Disable "Large Send Offload (LSO)"

These settings makes little to no difference. Please dont copypaste the same answers again... Looking in Microsoft forum is actually depressing, nothing works and every answer by microsoft has the same generic and useless solution (no one has given a positive feedback on any of the pages i've looked into). I've spend over two days trying to find something.

Other links i've looked (any were helpful, with the same generic answer and no solution provided:

Will the solution be to abandon windows altogether?

Windows for home | Windows 10 | Internet and connectivity

Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

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  1. Anonymous
    2022-10-24T09:22:00+00:00

    Hi Italo,

    Thank you for using our Microsoft community.

    This question is out of scope for the Answers Support Community. The best place to get help is Microsoft Ignite - Network(microsoft.com), where is intended to support more advanced users.

    Visit the following links for more information about it, hope that helps.

    Slow SMB files transfer speed | Microsoft Learn

    Fix Wi-Fi connection issues in Windows (microsoft.com)

    If anything is unclear, please do not hesitate to let me know.

    Best Regards,

    Mosken_L - MSFT | Microsoft Community Support Specialist

    2 people found this answer helpful.
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  3. Anonymous
    2022-10-24T09:37:28+00:00

    By default, Windows can max out the speed anyway. Its possibly a driver issue or at at least something specific to your situation (OS config by user or connection config not done right).

    1 person found this answer helpful.
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  4. Anonymous
    2022-10-24T18:17:25+00:00

    Hello, any idea where i could find more information on what OS config should i look for? I'm not sure about driver as it is able to transfer internet files very quickly. I have tried to transfer files in more than one computer from different brands (asus, dell and acer), all five of them had the exact same issue, i was only able to transfer it quickly over FTP.

    5 people found this answer helpful.
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  5. Anonymous
    2022-10-24T19:14:46+00:00

    It should just do it by default. Example of a test I just ran: enabled network sharing on a Windows 10 PC and shared a User folder named "test". Transferring from a Windows 11 PC to the Windows 10 PC transferred at 1000Mbps or approx 100MB/s of a 2GB file in the correct amount of time while using File Explorer.

    Both computers are connected via integrated 1GigE ethernet hardware with cat 5e cables, switch, and router. Nothing else was done. No networking driver configuration or Windows networking configuration on Windows. The Windows 11 OS was reinstalled clean to drive swap in the best way possible a few months ago and the Windows 10 PC was installed clean earlier this year I believe it was. They both use Windows supplied networking drivers.

    That tells me that something about your computer or network isn't working right. But, I've no idea what since by default Windows does more than "Windows explorer transfer speed: 5-10MB/s".

    Since your internet speed is higher then it suggests a networking hardware driver issue in relation to SMB as the driver can affect SMB (the router can also, etc) or maybe something off with that Windows installation with its SMB installation, etc. Maybe the driver for your networking hardware isn't fully compatible with Windows default settings. Just not sure.

    Wish I could give you a better answer. Though, I think this should help narrow it down for you. At least I hope so anyway :)

    Additional. The following link might be worth looking into if you haven't already https://learn.microsoft.com/en-us/windows-server/storage/file-server/troubleshoot/troubleshooting-smb

    Of course, different manufacturer networking hardware or router, etc should technically also work or otherwise there's something you do with Windows that causes it I would expect.

    4 people found this answer helpful.
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