This was created after 3 meshes import as subd (it`s sum of one boolean addition and one boolean substraction in MoI after import).

I`ve tried to do also ShrinkTrimmedSrf command on it becouse those surfaces are much bigger than real surfaces are. This file is too heavy for such a small thing.

Even after trim it`s too dense for fillet I think.

Is there some way to convert it with some less resolution? With lower subd level to have less points?

I create complicated shapes in subd but my cages are low poly.