I think, at those settings, you will find that only players with the latest graphics cards will do ok but most will struggle. The heightmap resolution has been recommended at 2049 and detail resolution at 2048.
You can find some exact descriptions of the terrain settings
here
Conceptually, the heightmap resolution means to me the number of triangles that will make up the terrain mesh. The larger the number, the more triangles. However, too big and most will not be able to handle it from a graphics processing standpoint. Now, if you divide your terrain width (3723m) by your heightmap resolution (4097px) = 0.9m/px, you get what I refer to as a
terrain resolution factor. This would be fine for building. It means 1 pixel is roughly 1 meter in Unity.
Your next thought should be to decrease your heightmap resolution to 2049 and your detail to 2048. However, at the current size of your terrain, 3723m, you will now see a
terrain resolution factor of 1.8m/px (3723m/2049px). This will then negate your ability to create fine detail. Now, I know this may be babbling nonsense but you will get it as you start to build.
My suggestion is to try and reconstruct/layout your course and lidar map in a different manner so that your dimensions of your terrain are at 2048x2048 or less. I have done the same with Kiawah is it runs linearly instead of boxy. It is a problem for trying to do real course creation and Unity/CF need for a square terrain as the main building terrain. If you do this, you will see a
terrain resolution factor of 1 or less and be able to happily contour your course.
What I have done on Kiawah is stack the front nine and back nine. It looks fine in game and you can use trees and hills to prevent view of the other nine should you choose to do so. (Red line present so you can see how I stacked the two nines. You will have to perform an identical split and stack for your Lidar heightmap.) An even better way may be to run the nines diagonally and you could potentially condense the course to an even smaller square and thereby improve your
terrain resolution factor.