Small steps from Wasteland Workshop:
Orginal 812 triangles
My version 264 triangles
This is 67,49 percent less !
Suppose we want to construct concrete circle.
Using Vanilla Meshes we need four quarter-circles and circle will have a 3728 triangles.
Mesh from my modification will have 1920 triangles allowing you to build a larger number of objects in the settlement.
Example for Wall.
Example of Stairs.