Unity Stats says my 1 triangle mesh is made out of 500 triangles.

Hello guys,
I want to make a 2D destructable level out of meshes which I create and handle in code. However by just creating the level my fps is dying.

I tested the thing with only one self-made triangle and thats the result:

Here is my custom made mesh in the Inspector: 183900-screenshot-1211.png
(no, there aren’t other meshes and if I create a mesh with 10 000 tris, the stats says there are 2 000 000 tris)

The problem was the Gizmos.

I don’t know why, but if I turn off the gizmos, the triangle count become normal. (from 2M to 2.7k tris)
I draw a gizmo sphere for every verts…it look like they are made out of a bunch of triangles.