Attaching multiple actors to another moving actor causes great framerate drop

I need to spawn them as actors since they are each going to perform different actions on their own and, they are like pieces you can use to build, i just allowed the player to also attach them on top of vehicles. So each piece used to build for example a house can also be placed on top of the vehicle. Anyways, the amount of actors attached to the vehicle starts to lag when i reach about like 30 of those the last time i checked. How could i spawn them in as components when attaching them to the vehicle? I thought that the attach node would change its hierarchy and make it sort of part of the actor i was attaching it to!?!?!?!? About the drawcalls, i havent checked yet, i’ll open up the engine in a while, give me like 30 mins to do it cause right now im in the middle of something. Thanks for the reply!