The color of a source's title bar reflects its switched status: blue means off air, yellow is preview mode and green is on air. With "OFF-AIR OPTIMISATION" activated, sources currently off-air are going to send their content at 1/8th of their size and at 1 frame per second. This results in 3 benefits: a reduction of the bandwidth usage, a reduction of CPU/GPU and memory usage on the ReflexNDI host computer and a reduction of memory and CPU/GPU usage on the video switcher computer.