The INOGENI dongle has an intrinsic 2-frames delay. There will be another delay introduced by the UVC driver of the operating system. In 1080p60 -> 1080p60, we can have a minimum of 66ms delay between the HDMI input and the rendered stream. In 4K30 -> 4K30 I420, we can have a minimum of 133ms delay between the HDMI input and the rendered stream. In order to reduce this latency, be sure to use the simplest application with the simplest video graph.