bGenerateOverlapEvents Is this heavy for complex collision?

If we use Physical complex collision for Complex Mesh Whether strongly affects performance this (bGenerateOverlapEvents) Overlap events?
Or is it better to add an additional a simple collision(Like a SimpleBoxCollision) for overlaps, and difficult to leave only for physics processing(block hit) ?
I need 2 functions for the object. block for static object and overlap for my type of collision profile

What’s better for performance?