In an optimized workflow, means low-latency, pre-cached, state-ready transitions . A "hot refresh" is one where the frame buffer is ready to flip the moment a new mode is requested.
Are you trying to set this up for a like Panasonic or Sony, or are you working with a custom HTML/JavaScript viewer? viewerframe mode refresh hot
: This setting is gaining traction because it significantly reduces network load In an optimized workflow