I just created a new 3 min. long video of 3 moving groups with 40 units in each in an example level containing vegetation and buildings (functioning as different sized obstacles):
Everybody is moving fine without further map processing required, so I'm happy now laugh
Graphics is nothing special because I use 3dgs extra on an old pc... and better usage of lod will improve performance.

Free world editor for 3D Gamestudio: MapBuilder Editor