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Network Throttling (2.5G NIC) and Broken Feedback Hub on Windows 11 25H2 (Build 26200.8328)

lee 0 Reputation points
2026-05-07T14:58:50.3033333+00:00

(System Environment)

  • OS Build: Windows 11 Pro 25H2 (Build 26200.8328)
  • Hardware: 2.5G Ethernet Adapter (Realtek/Intel)
  • Network: 2000Mbps Fiber (Confirmed full speed on a separate Windows 10 drive)
  1. Network Throttling: After upgrading to 25H2, my 2000Mbps bandwidth is capped at 500Mbps. Running Disable-NetAdapterRsc -Name * as Administrator did not resolve the issue.
  2. Broken Components: The Feedback Hub app fails to launch, and system-wide feedback shortcuts are unresponsive.
  3. Update Status: The issue persists even after installing the latest KB5083631 update.
  4. A/B Testing: On the same hardware, switching to a Windows 10 drive results in full 2000Mbps speed, confirming this is a Windows 11 kernel/driver regression.

I am looking for confirmation on whether there is a known bug in the 25H2 network stack (RSC) or NIC driver compatibility, and if a fix or workaround is available.

Windows for home | Windows 11 | Internet and connectivity
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  1. Clary-N 11,395 Reputation points Microsoft External Staff Moderator
    2026-05-08T06:35:32.37+00:00

    Hi lee,

    Thank you for the detailed information you’ve shared so far, it really helps narrow down the issue.

    To further isolate whether this may be related to TCP auto-tuning behavior on Windows 11, could you please try the following steps?

    First, open PowerShell as Administrator, then run this command then hit Enter:

    netsh interface tcp show global

    After running it, check the value for Receive Window Auto-Tuning Level:

    • If it shows Normal, please run the following command to temporarily disable it:
    netsh int tcp set global autotuninglevel=disabled
    • If it already shows Disabled, please switch it back to the default by running:
    netsh int tcp set global autotuninglevel=normal

    After making the change, kindly test your network speed again and let me know if there is any improvement in bandwidth.

    If you’ve already gone through these checks and the issue persists, I would recommend reach out to Microsoft Support and connect with a live chat agent since this is a user-to-user forum and we do not have the tools nor access to confirm if this is an ongoing issue or not. The steps I provide above is a temporary workaround, once you connect with a live chat agent, they can provide you with further support and a more direct answer about this issue.

    • Describe the issue that you're facing
    • Scroll down and then Login using your personal account
    • Click Get Help > Scroll down and click Contact Support
    • Select the appropriate Products and services
    • Click "Chat with a support agent in your web browser"

    And you also mentioned that the Feedback Hub app is failed to launch, you can also try the link below:

    Submit feedback via Microsoft Feedback Portal

    Please try the workaround and the Feedback link again to see if you can open the Feedback Portal.

    If you have extra questions about this answer, please click "Comment".  

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

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  2. AI answer

    2026-05-07T14:59:04.2233333+00:00

    There is no mention in the provided Windows 11, version 25H2 release‑health documentation of a known issue with 2.5G NICs, RSC, or general network‑stack throttling on build 26200.8328, nor of Feedback Hub being broken on this build.

    The current status pages for Windows 11 25H2 and 24H2 explicitly state that there are no active known issues at this time. The resolved‑issues list for 25H2 also does not include any item related to:

    • Reduced throughput or bandwidth caps on high‑speed Ethernet (including 2.5G adapters), or
    • Feedback Hub failing to launch or system feedback shortcuts not working.

    The only networking‑related items in the context concern specific connectivity‑state issues that are resolved by later cumulative updates, and they do not describe throughput throttling or NIC‑specific regressions. Likewise, the guidance for reporting Windows issues continues to point to Feedback Hub as the supported channel, but there is no note about Feedback Hub being unavailable or broken on 25H2.

    Based on the available documentation:

    • No official known bug is documented for 25H2 that matches 2.5G NIC bandwidth being capped at ~500 Mbps.
    • No official known bug is documented for Feedback Hub being non‑functional on 25H2.
    • No specific workaround or fix is documented for these symptoms beyond the general guidance to keep devices updated and to use Feedback Hub or Microsoft Support to report issues.

    If the device is fully updated and still affected, the documented next steps are to:

    • Use the Get Help app or Microsoft Support for direct assistance on a home PC.
    • Use Feedback Hub when it is functional, or Microsoft Support channels if Feedback Hub cannot be launched.

    References:

    AI-generated content may be incorrect. Read our transparency notes for more information.

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