Harpoon 3 Advanced Naval Warfare is the result of decades of development and fan support, resulting in the most comprehensive, realistic, and accurate simulation of modern combined air and naval operations available to the gaming public. New features include, multiplayer support, third party databases, scenario editors, and OVER 300 pre-built scenarios!
I believe it is an issue with the UI in how it intersects polygons with the map window. In this case, it is not impacting the performance of radar. However, the same function works for uncertainty zones with contacts and that's where the real impact to how the game engine performs. This is a good example and I'll certainly use it in my testing.