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Microsoft finally fixes Windows 11 slow file copy issues over SMB

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Microsoft has finally fixed a known issue that causes severe performance degradation when copying large files over SMB after installing the Windows 11 2022 update.

This bug was fixed in the February 2023 non-security preview update KB5022913, released in February 2022, which also introduced the newly announced features of Moment 2.

“This update fixes an issue affecting copying from a network to a local drive. Copying is slower than expected for some users,” Microsoft said.

The fix, as Microsoft’s Ned Pyle wrote in his Oct. 22 H2, “remotely shows slow performance when copying large files from his computer to a Windows 11 computer, or when copying files to a local drive.” It will be done after stated.

Redmond hasn’t shared details about the actual performance degradation, but users report that the time taken by file operations on the affected system can more than double for him under certain conditions. there is. “This issue is more likely to occur when copying files from a network share over Server Message Block (SMB) to Windows 11 version 22H2, but local file copies may also be affected. ,” Microsoft added in the September update supporting preview update documentation. KB5017389.

Two months later, in November, the company began testing the patch that was deployed to some systems enrolled in the Windows Insider Program running Windows 11 Preview Build 25252.

Workaround available

KB5022913 allows Windows administrators to test improvements and fixes that will be rolled out to all Windows users in next month’s Patch Monthly.

However, it is optional and does not include security updates. To install the KB5022913 optional update, you must click the Download and Install button after checking for updates in Settings > Windows Update. You can also manually download and install the KB5022913 update for your platform from the Microsoft Update Catalog.

Microsoft has also released a temporary fix that affected customers can use to avoid a performance hit when copying files.

Users can use a file copy utility that does not use a cache manager (buffered I/O) to mitigate known performance issues affecting file copies over SMB.

The two options available include the built-in Robocopy and Xcopy tools, and the template commands are:

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


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

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