From time to time there is a random issue that causes extreme loading times. The first time this happened it took 8 minutes to load the map, and today it happened again taking about 5 minutes to load. So far this has only happened on the PoF maps. Unsure what causes this.
As an update, the issue doesn't occur only when using Waypoints, and some people I know stated this can happen even outside of PoF, it just seems to occur more often in PoF for unknown reasons.