> A persistent connection has a cost. are you sure? specifically, are you sure a persistent connection has _more_ of a cost than repeatedly re-establishing a c

> A persistent connection has a cost. are you sure? specifically, are you sure a persistent connection has _more_ of a cost than repeatedly re-establishing a connection & TLS, etc.? in terms of energy costs alone, DNS resolution, establishing routes, generating cryptographic session keys, etc. it's definitely not as cheap. in terms of today's computation power, the "memory" costs of maintaining a connection are minuscule, and the performance "penalties" are negligible. example: lets say you have 50k event subscribers. if nothing happens, then, aside from a few TCP keepalives (which are not strictly speaking required, and can happen very infrequently), no traffic moves. if instead you have polling once every second, then that's nearly ~13-14 connections a second, each one with at least 4 round trips of traffic. that's a measurable amount of load.