There are three rules that affect the frequency with which NPCs will scan for the best Z-coordinate (elevation) for their current position.
Map:FixPathingZWhenLoading set to true will determine the best Z for each spawn point, once for the zone (I think).
Map:FixPathingZAtWaypoints set to true will have the server check each waypoint along a grid for the best Z-coordinate to reach it. Uses slightly more CPU power than the previous one.
Map:FixPathingZWhenMoving set to true will cause NPCs to constantly check for the best Z coordinate for their current position as they traverse their grid or roaming boxes. I think it does its check each second or something. This uses the most CPU power, but computers running servers in 2015 are unlikely to see any kind of performance hit, really. It was more of an issue 10 years ago.
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