[German]I would like to discuss an observation made by a blog reader about Microsoft Windows 11 24H2. This reader has noticed that the transfer rates for reading and writing via SMB have become abysmal since he updated his machine to the new Windows 11 version. Maybe someone from the readership has an idea what is going on.
Advertising
Many issues with Windows 11 24H2
Since October 1, 2024, Windows 11 24H2 has been generally available for "willing testers" (see Windows 11 24H released (Oktober 1, 2024)). It is a so-called "major" feature update in which the entire operating system kernel is replaced. The enablement updates used in previous feature updates to enable new functions are therefore not available.
In the articles Windows 11 24H2: Numerous show-stoppers and known bugs and Windows 11 24H2: Serious issues after upgrade, there are indications that there are some serious problems (see also links at the end of the article).
Reader report about SMB transfer rates
German blog reader Stefan M. contacted me by e-mail and wrote that he noticed a strange behavior on Windows 11 24H2. He only achieved very poor transfer rates when restoring his data with Veeam from his WDMyCloud NAS. At first he thought it was an exception during a single restore.
But after taking a closer look, the reader noticed that even normal copy jobs from the NAS to the computer with Windows 11 24H2 (via a gigabit connection) managed a maximum transfer rate of 15 MByte/s. As a test, the reader tried the file transfers in a virtual machine under VMware Workstation with Windows 11 23H2 as the guest operating system. There he got an increased transfer speed of 90-100 MByte/s during file transfer. A value that he was also used to before.
Advertising
Various tests without result
The blog reader wondered and then switched off Microsoft Defender for testing, but without any resounding success. Since the backup to the WDMyCloud NAS takes place via a network connection using the Server Message Block protocol (SMB), he also ran the TCP script from my blog post Microsoft's TCP mess, how to optimize in Windows 10/11.
Transfer rates Windows 11 24H2 (left), 23H2 (right) click to zoom
But that didn't work either! The screenshot above shows the comparison of the SMB parameters (Windows 11 24H2 on the left, Windows 11 23H2 on the right). He then set up a virtual machine (VM) with Windows 11 24H2 for comparison purposes.
The result was also an extremely slow data transfer via SMB from and to the NAS unit. Copy jobs to the NAS are just as slow, writes the reader. The transfer rates are far below the values he achieves with Windows 11 23H2.
As a side note, the reader remarks that he had set up his computer completely fresh with Windows 11 24H2 last week. He then wondered why it took over 20 hours to restore his backed-up images/data. He was not used to this and started testing.
The WDMyCloud NAS runs with SMBv3 and NTLMv2 and he cannot define any more setting details here. The reader asks at this point: "Maybe you or the community have an idea". I don't have any ideas, but I also don't have Windows 11 24H2 running anywhere. At the moment, I'm not aware of anything like this that I can think of ad hoc.
Similar articles:
Windows 11 24H released (Oktober 1, 2024)
Windows 11 24H2: Numerous show-stoppers and known bugs
Windows 11 24H2: Serious issues after upgrade
Attention: Windows 11 24H2 changed default settings for standby
Windows 11 24H2: Administrative templates (.admx)
Windows 11 24H2: Activation lost?
Advertising
