How long for events to show in the timeline?

I have a Ring Pro doorbell cam. When a motion alert comes in through on my iPhone, if I open the ring app directly, I do not see the event in the timeline. In many cases, by the time the app is opened, the live view does not show the action that caused the alert. The event will eventually show up on the timeline, but it takes several minutes. Why does it take so long for an event to show up on the timeline? The signal strength is good and connected to the right Wi-Fi.