Several users (me among them) have reported constant frame rate drops with Shipwrecked on PS4. Klei have already confirmed that they are working on the issue, but as weeks & months go by, we see that some patches have been launched while the problem remains unsolved. I am aware that I'm a pain-in-the-ass user but to me and other players this is a far more critical and important issue than if the volcano is correctly balanced... I hope someone reads my umpteenth message in a bottle.
Just check what happens on an island with monkeys, trees, rocks, etc