Priority is which queue - High or Low.
Important is whether it is queued at the front or back of that queue.

Redirect 302 are those that should be put at the front as they are part of an existing request.

Refresh and submitting updates to servers are examples of where you use high priority.

Personally I felt this needs the same responsiveness as CTRL-F5 Refresh and so set it this way, however if we want DiscID to be even higher priority than a refresh, we can set Important back on this.