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Windows 11 2022 Update slowing file transfers by up to 40%

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What you need to know

  • The Windows 11 2022 Update includes a bug that can lower the speed of copying larger files.
  • Larger files can see as much as a 40% throughput drop over SMB when reading a file.
  • The issue is not within SMB code, but it most likely to be noticed when transferring files over SMB.

Microsoft recently confirmed an issue with the Windows 11 2022 Update that can slow down file transfers. The bug affects multi-GB files and can reduce throughput by up to 40%. The problem is specific to the Windows 11 2022 Update (Windows 11 version 22H2).

“There is a performance regression in 22H2 when copying larger files from a remote computer down to a Windows 11 computer,” explained Microsoft’s Ned Pyle (opens in new tab). “A large (multi-GB file) might see as much as 40% less throughput over SMB when copying down (reading). Copying that same file to a non-22H2 machine (writing) won’t see this problem.”

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