Island Paradise Lag issue solution (no mods required)

I’m aware this is an old post but if anyone is looking for a solution still I’d like to point out that deleting the Scott family’s house boat and moving them to a regular house + reseting all my sims has really helped with the lag and i can safely say I don’t have it anymore. I’m not sure if deleting the school/stadium combo did anything because my lag was gone before I did it so your choice to do it....