This visualizes input-to-execution latency (in ms). Input to execution latency is important when you're working with games that operate on real-time where every millisecond counts. Here's something to help visualize that concept which doubles as tool to help in picking networking protocols based on their reported latency.
Actual use case:
Deciding between having a UDP service with websocket fallback or going purely with websockets and designing around the websocket latency
Using this as a tool to weigh your options is great so you don't decide off numbers alone.