This may refer to the old style video-specific YUV overlays, which I don't think DWM uses or supports these days. Video playback doesn't need low latency anyway

This may refer to the old style video-specific YUV overlays, which I don't think DWM uses or supports these days. Video playback doesn't need low latency anyway, just predictable latency, which DWM can provide in normal operation. Fullscreen exclusive mode support is still common in games.