Island Paradise Lag issue solution (no mods required)

I've been playing the Arias who are on a houseboat. Should I move them as well?

You only have to move NPC families. You can even play the Scotts on their houseboat - if you can control them, you can liberate them if they get stuck. The problem with the four families I mentioned is that, as NPC sims, they often get stuck in the water under their houses or don't find the way to their boats. This causes the lag.

The Arias don`t have such routing issues as far as I know.