Specifically on the latency question, have a look at https://stackoverflow.com/a/18779822 https://stackoverflow.com/a/18779822 for a basic explanation. tldr, on

Specifically on the latency question, have a look at https://stackoverflow.com/a/18779822 https://stackoverflow.com/a/18779822 for a basic explanation. tldr, once you allow for two-way communication you can start to factor out the network delay.