Uncapped FPS / V-Sync OFF starves Windows DWM presentation queue & freezes secondary video

Note: AI assistance was utilized to help diagnose the underlying driver execution mechanics and assist in drafting this technical report. I am happy to provide additional logs, feedback, or testing as needed.

The issue does not occur in the main menu—only once loaded into a live simulation world.

Workaround / Fix Found:Enabling V-Sync inside SE2's in-game graphics settings immediately resolves the issue. Capping the frame rate prevents the VRAGE3 engine from over-saturating the presentation queue, allowing Windows DWM to process secondary monitor display updates smoothly.

System Hardware & Display Topology:

• Primary Display: Samsung Odyssey Neo G9 57" (32:9 Super Ultra-Wide, High Refresh Rate)
• Secondary Displays: Wisecoco and two Asus Displays
• Primary GPU (Rendering Game): NVIDIA GeForce RTX 4090
• Secondary GPU (Displaying Secondary Workloads): NVIDIA T1000 (8GB)
• Integrated GPU (Present in System): Intel UHD Graphics 770
• OS: Windows 11
• NVIDIA Driver: Studio Driver 610.88

Steps to Reproduce:

1. Open a video stream (e.g., YouTube) in a browser on a secondary display.
2. Launch Space Engineers 2 and load into an active world save on the primary display.
3. In SE2 Graphics Options, set V-Sync to OFF (allowing unconstrained frame rendering).
4. Click into the SE2 window to give it focus $\rightarrow$ Secondary display video stream freezes / micro-stutters.
5. Alt-Tab out of SE2 or set V-Sync to ON $\rightarrow$ Secondary display video stream instantly resumes smooth playback.

Expected Behavior:The engine should manage its presentation queue depth and yield execution cycles back to the OS scheduler so background DWM presentation events on secondary displays remain smooth even when running uncapped.