I am going to look into the lag problem, and may have a talk with Ruthven about disabling the boat system and having someone with the lag issue play test it. I am with Ruthven here though in that I do not have this lag problem myself either. My other thoughts is maybe we need to drop the amount of parties on the map, but again this will have to be play tested with someone that has the lag.
Anyway, it's on my long to-do list that's for sure.