What’s new: Microsoft has confirmed that the August 2025 security updates (KB5063878 for Windows 11 24H2 and KB5063709 for Windows 10 21H2/22H2) are causing severe lag and stuttering issues with NDI streaming software on some Windows systems. This affects streaming applications, including OBS, particularly when ‘Display Capture’ is enabled. The issue is linked to RUDP connections, while UDP and Single-TCP remain unaffected.
Who’s affected
Users of Windows 10 (21H2/22H2) and Windows 11 (24H2) who have installed the August 2025 security updates and utilize NDI streaming software are experiencing performance problems.
What to do
- Change the NDI Receive Mode to use TCP or UDP instead of RUDP. Steps include:
- Download and install the free NDI Tools pack.
- Launch the NDI Access Manager app.
- Go to the Advanced tab and change Receive Mode to Single TCP or UDP, then press OK.
- Repeat on any other affected computers.
