@Werusek-2000 I guess I don't know what to tell you. I know about ladder issues and houseboat issues and some weirdness when a house is built on stilts, but I don't really understand why this would happen without any of those factors, and no custom content or mods that affect idling. I also haven't seen it in my game at all, including in my current save, where the main household has a dog and there are plenty of cats roaming around.
Raccoons are built on the cat model, and deer on the horse model, so it makes sense that raccoons would be affected and not deer.
For the specs, I was looking for the info under About This Mac: everything except for the serial number. And I'd like to know what graphics settings you're using as well; mine are on ultra other than water and high-detail lots.
For what it's worth, World Adventures isn't buggy at all if you exclude the mostly minor routing issues in the WA worlds. Even that isn't too bad—my sims just got back from a 10-day trip to Shang Simla, and I think I had a total of three notifications about stuck sims. The only Showtime glitch that affects performance in any meaningful way is the overproduction of career performance limos, and that can be disabled with NRaas Traffic. The world of Isla Paradiso has many issues, but the rest of the pack's content is fine to use in any world that has room for it. I understand if you don't want to use all the packs; I'm just saying you could.