Microsoft Acknowledges Significant Lag Issues in Windows 11 24H2 and Windows 10 Due to August 2025 Update
Microsoft has officially confirmed that its August 2025 security update is causing significant performance issues for users of NDI (Network Device Interface) technology. Content creators, broadcasters, and IT professionals who installed the update are experiencing severe lag, stuttering, and choppy audio/video when streaming between PCs, disrupting production workflows reliant on this popular IP video protocol. The problem stems from cumulative update KB5063878, released on August 12, 2025, for Windows 11 and Windows 10. According to Microsoft’s updated release health dashboard entry on August 21, the issue affects systems running OS Build 26100.4946 and other recent versions. Performance degradation is particularly noticeable in streaming applications like OBS (Open Broadcast Software) and the official NDI Tools suite. Users have reported that the issue is especially triggered when using “Display Capture” on the source machine to send its screen output to another computer on the network. Notably, the problem persists even on networks with low bandwidth utilisation, indicating that the root cause is not network congestion but rather a processing or protocol-handling flaw introduced by the Windows update.
While Microsoft investigates a permanent solution, a temporary workaround has been recommended by NDI. The issue appears to be related to NDI’s default transport protocol, RUDP (Reliable User Datagram Protocol), which balances the speed of UDP and the reliability of TCP. The KB5063878 update seems to interfere with how Windows handles these RUDP packets. To mitigate the problem, users are advised to manually change the NDI Receive Mode on the receiving client to use either TCP (Transmission Control Protocol) or UDP (User Datagram Protocol) instead of the default setting. NDI has published guidance on its support site, titled “Traffic Drops After Windows Update,” which provides step-by-step instructions for making this change within the NDI Tools and other compatible applications. Microsoft has stated, “We are investigating this issue and will provide more information when it is available.” This confirmation suggests that a fix will likely be delivered through a future cumulative update or a possible out-of-band (OOB) patch. Until then, professionals who rely on NDI for live streaming and remote production may experience ongoing disruptions.
Categories: Software Issues, Streaming Performance, Workarounds
Tags: Microsoft, August 2025, Security Update, NDI, Performance Problems, Streaming Applications, OBS, RUDP, TCP, Workaround