This change reduces the distance at which player characters are replicated on boats. We brought the number down so it matches the values on land, out in the sea, and in the air (gliding). It will by proxy improve server and client performance, as it's quite a taxing thing. It also allowed us to tweak up NPC replication values, which again should result in both client and server performance gains, and it's opened the door for some other things that we're looking into.. which will also result in a gain if things work out Server and client performance will always continue to be something we put some time and attention into.