Optimization mesh, fbx option


hi!, im new user and novice in qubicle 2.0

I’m using UE4, and I have a problems when selecting the best option to export FBX with a good optimization in the mesh reducing geometry the best you can.

if you reduce the geometry but I think I’m not doing it right or is there something I should know before selecting export options??

someone can guide me a little about that?