Child of a Blueprint, in a blueprint, in another blueprint. Frame rate?


im currently working in small team. We have a modular building set to create rooms that are fully destructible.
We have a base wall blueprint which holds I think a wall but has the relevant scripts it needs. That base wall is then used for another wall blueprint which is used in another blueprint to double up the walls, that is then used in the room blueprint. this is the story for many of the pieces especially the rooms themselves which reference a base room blueprint.

i put a one of the rooms I just created in the world which has 100 child actors in and my frame rate started at 40 and bled all the way down to 4. I’ve been trying to rule out causes.
could the hierarchy blueprints be a possible cause?