@crinrictSo i tested Red Roan Field with another house I built on a 64x64 lot. I played for 2 and half hours and it ran perfectly, didn't crash or lag. This house was mostly cc as well.
Edit: One thing I know for a fact has been an issue with this particular house is my farm animals. my chickens, goats, and cow reach elder status, I get a notification that they're old and going to die soon, and then they revert back to young adults. Besides that I've had no other noticeable issues with the house. When I tested with the other house I had none of my farm animals on the lot (only my horses) and it didn't crash. And this house uses a lot of the same cc as the farmhouse I had on Red Roan Field.