Thanks Michael. I`ve already have got that option enabled. There is no option to go lower than that.
Those small polygons are only on corners (baked fillets - additional loops on hard corners).

Today I`ve thought that I will do ONLY booleans in MoI and next I will do mold for that part (aslo in MoI).

My final object are build from many small subd objects which are added, substracted and intersected with each other.
I`ve thought to import all AS IS in subd and do only that booleans operations which will allow me to rebuild my subd model without rebuilding it in nurbs.

In that idea I don`t need MoI fillets, blending and thickening. I need do only booleans.

But its about 20 big subd objects with small creases = big dense objects inside MoI.

That`s why I had idea to lighten it more. I`ve gave up with filleting and thickening.

But it`s still very heavy for MoI eaven if meshes are not high poly (because of creases).