I'm going to guess: - If you are logged into the Analytics dashboard, then a web-socket has been activated between your browser and GA. For fast lookup, there'

I'm going to guess: - If you are logged into the Analytics dashboard, then a web-socket has been activated between your browser and GA. For fast lookup, there's probably an in-memory hash of GA IDs, web-socket IDs. SO: - User visits your webpage / performs some action worth analyzing. - GA script gets executed; sends request to GA server. - GA server acknowledges reception and schedules jobs for: -- storing the hit for associated GA-ID. -- sending info of hit to websocket associated with GA-ID.