If you (like I) opted in for the Early Access to the April Release you can already now take a peak into some of the upcoming features, eg "email reaction time" - a new feature to display how quickly a contact reacts to messages arriving at different times.
Simply navigate to a contact who recieved an email in one of your customer journeys (1), click the Insights tab (2) and then click Optimal Sending Time (3) to display a bar chart "Email reaction time"
- The horisontal axis is "Time of delivery (hour of the day)" - the time of day the mail(s) was delivered
- The vertical axis is "Reaction-time score (higher is better)" - the reaction score for the delivery times (average, if more than one mail)
- The bar(s) are the average reaction score for each delivery time - a high score indicates a fast reaction time.