We prioritize people that are the furthest in the workflow, based on the delay component in the workflow builder. This only applies to email sending. The other productivity tasks, or slack/teams components are instant.
This means that if a person is at the 4th step in your workflow is prioritized over a person who is on the 3rd step. People can exit early, for instane when they respond to a message.
Our sending algorithm mimics human-like sending to ensure that you always reach the inbox, and not the promotions and spam folder.