• Microsoft : Investigating Slow copy of big files

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    Copying large multiple gigabyte (GB) files might take longer than expected to finish on Windows 11, version 22H2. You are more likely to experience this issue copying files to Windows 11, version 22H2 from a network share via Server Message Block (SMB) but local file copy might also be affected. Windows devices used by consumers in their home or small offices are not likely to be affected by this issue.

    To mitigate this issue, you can use file copy tools that do not use cache manager (buffered I/O). This can be done by using the built-in command-line tools listed below:

    robocopy \\someserver\someshare c:\somefolder somefile.img /J


    xcopy \\someserver\someshare c:\somefolder /J

    We are working on a resolution and will provide an update in an upcoming release.

    Ned Pyle Microsoft
    I can’t share too many details yet, but we know exactly where it is getting slower in Kernel, nothing to do with SMB or compression.

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