Microsoft has acknowledged significant performance issues stemming from the August 2025 security updates, particularly impacting NDI (Network Device Interface) streaming software on select Windows 10 and Windows 11 systems. Users have reported a variety of performance challenges, notably severe lag and stuttering, when utilizing popular streaming applications such as OBS (Open Broadcast Software).
Details of the Performance Issues
According to a recent update from Microsoft, the problems manifest as “severe stuttering, lag, and choppy audio/video” during streaming or while transferring audio/video feeds between computers post-installation of the August 2025 Windows security update. This situation is exacerbated when ‘Display Capture’ is enabled on the source PC, and it persists even under low bandwidth conditions.
The specific updates causing these disruptions are KB5063878 for Windows 11 24H2 users and KB5063709 for those on Windows 10 21H2/22H2. The NDI team has corroborated these findings, noting that the problematic updates lead to unexpected drops in NDI traffic, affecting only RUDP connections, while traffic transmitted through UDP or Single-TCP remains stable.
Temporary Workaround for Affected Users
In light of these issues, NDI has provided users with a temporary workaround as Microsoft investigates the underlying bug. Users can adjust their NDI Receive Mode to utilize TCP or UDP instead of RUDP. The steps to implement this workaround are as follows:
- Download and install the free NDI Tools pack.
- Launch the NDI Access Manager app.
- Navigate to the Advanced tab and change Receive Mode to Single TCP or UDP, then click OK.
- Repeat these steps on any other affected computers.
In addition to these streaming issues, Microsoft has recognized other complications arising from the KB5063878 and KB5063709 updates. Shortly after the release of the August cumulative updates, the company addressed a known issue that caused security updates delivered via Windows Server Update Services (WSUS) to fail, resulting in 0x80240069 errors following the installation of KB5063878. A week later, emergency updates were rolled out to fix another issue that disrupted Windows reset and recovery operations after the installation of KB5063875 (Windows 11), KB5063709 (Windows 10), and KB5063877 (Windows 10 Enterprise).
Furthermore, Microsoft has solicited feedback from customers regarding failure and data corruption issues affecting solid-state drives (SSDs) and hard disk drives (HDDs) on Windows 11 24H2 systems post-installation of this month’s security updates.
