Users who installed Windows 11 24H2 complain that they experienced extremely slow read and write speeds over the SMB protocol. A user reported that while using specialized software to restore data from a WDMyCloud NAS, he experienced a very slow data transfer rate.
SMB Slow Data Transfer Speed
The user copied files from the NAS to a Windows 11 computer on a gigabit network connection, but the maximum transfer rate was only 15 MB/s.
A comparative test on a virtual machine with the previous version of Windows 11 23H2 showed that the speed in guest mode reached up to 100 MB/s.
It is hard to say what exactly causes the slowdown. As you may remember, Windows 11 24H2 enables SMB encryption and requires it by default. Maybe this change is responsible for the slow data transfer speed. If so, it is easy to disable it as described in the linked tutorial. In short, run these commands as Administrator:
reg add "HKLM\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters" /v RequireSecuritySignature /t REG_DWORD /d 0 /f
reg add "HKLM\SYSTEM\CurrentControlSet\Services\LanManServer\Parameters" /v RequireSecuritySignature /t REG_DWORD /d 0 /f
Sadly, this is not the only issue with the network stack on Windows 24H2.
VPN Issues
After installing Windows 11 24H2, several users hit into the issue with VPN connections. Specially, CheckPoint VPN operates at extremely low speeds. Also, it starts disconnecting after a short period of time. Thankfully, these issues could be mitigated by enabling and starting the Routing and Remote Access Service (RRAS).
Source: BornCity
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I just think 24H2 should have stayed in beta testing a bit longer. I am sure Microsoft was in a rush to push out all the AI stuff as was baked into the release. Luckily, Windows 11 is not my primary OS anymore and I mostly use a older Windows 10 machine that has actually been rock solid for years.
Bottom line, only NAS that works with Windows 11 24H2 is the QNAS, WD Clouds have issues as for my testing, only thing you can access is the GUI interface, all features worked with 23H2. Microsoft is falling apart with very poor software updates, all my other win 11 will remain on 23H2 forever, if need be, Microsoft seems to not know what they are doing, it sounds like they have bad developers today. I will not go past 23H2 and i may roll back to that version. 24H2 kind of sucks.
Sorry to say; I own a Qnap NAS and I experienced the same speed problem. The two commands did fix it. So it is a Microsoft problem and it probably affects all systems.