Which pack took more tech resources?

My game tends to run smoothly - as well as Sims 4 can run smoothly, at least; it's a lowkey mess even on a good computer and with few packs. I even bought a top-of-the-line computer, and every game but Sims 4 runs like a dream.

But something about the open spaces in the Cottage Living world makes my game run like a slug. I'm not sure it's necessarily the size of the space, since I can run worlds like Moonwood Mill just fine.