a large file (several GB) may see up to 40% slower speed on Server Message Block (SMB) when copying (reading). Copy the same file to a machine [non mise à niveau vers] 22H2 (write) will not encounter this problem
Pyle notes that the problem isn’t in the SMB code, but that’s the most likely scenario where you’ll notice the problem. This means that the slowdown is not necessarily seen only in the network share, but it can also be seen in the transfer of local (large) files. According to Pyle, however, it is possible to work around the problem and describes how, using robocopy or xcopy with the /J (unbuffered IO) parameter:
robocopy \\a_server\a_folder c:\a_folder a_file.ned /J
Using this command to copy a file will restore the transfer speeds that existed before the Windows 11 22H2 update.