[German]Users have reported a serious drop in speed when copying large files under Windows 11 22H2 – and individual Microsoft employees as well as Microsoft itself have also confirmed this (see also the blog post Windows 11 22H2: Microsoft fix for file copy performance issues is coming for details). The Insider Preview from November 28, 2022 already had a fix for some file copy issues. And this fix has now been rolled out with the security updates (Patchday: Windows 11/Server 2022-Updates (13. Dezember 2022)) on December 13, 2022. But as mentioned below, the kernel file copy bug is still unfixed, as the known issues section of the updates states.
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no it is NOT, guenni
MS article 5021255 still lists the "Copying large multiple gigabyte (GB) files might take longer than expected" problem as one of the "known issues" with that update:
https://support.microsoft.com/help/5021255
Thx, my fault. They fixed a bug in file copy in preview – and I saw the know issues, but mixed it wrong within the 1st edition of the above article.
it appears to be included in the recent Jan.5, 2023 insider 2262x.1095 builds:
https://blogs.windows.com/windows-insider/2023/01/05/announcing-windows-11-insider-preview-build-22621-1095-and-22623-1095/
"We fixed an issue that affected how fast you could copy items from a network to a local computer. For some users, the copy speed was slower than expected."
now Ned has confirmed the KB5022913 update does actually include the copy performance bugfix:
https://techcommunity.microsoft.com/t5/storage-at-microsoft/slower-smb-read-performance-for-large-files-in-22h2/bc-p/3686553
"Fix update 03/06/2023: update February 28, 2023—KB5022913 (OS Build 22621.1344) Preview – Microsoft Support contains the kernel update that fixes this issue. "
Thanks – see Windows 11 22H2: Fix for performance issue when copying files available