Security News > 2023 > March > Microsoft finally fixes Windows 11 slow file copy issues over SMB
Microsoft has finally addressed a known issue causing significant performance hits when copying large files over SMB after installing the Windows 11 2022 update.
The fix comes after Microsoft's Ned Pyle explained in October that "There is a performance reduction in 22H2 when copying larger files from a remote computer down to a Windows 11 computer or when copying files on a local drive."
"You are more likely to experience this issue copying files to Windows 11, version 22H2 from a network share via Server Message Block but local file copy might also be affected," Microsoft added in a September update to the KB5017389 preview update support document.
KB5022913 allows Windows admins to test improvements and bug fixes that will roll out to all Windows users with next month's Patch Tuesday.
Microsoft has also shared a temporary fix that affected customers can use to workaround the file copy performance hit.
Users can mitigate the known performance issue impacting file copying over SMB with the help of file copy utilities that don't employ cache manager.
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