I think it has to do with the new update. I played through this map multiple times when testing it and I had that a happen a few times but then didnt have any issue other times. i also experienced an issue where sometimes when i played on the map some of the structures e.g. one of the sea bases and one of the ships just wouldnt spawn in the map. and then all of the items in them would just be floating in the air. but when i went back to the map editor everything was fine and then the next time i loaded the map up in game it didnt happen... so i think it has to do with the new .76 update that released.
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On a default island i have ~100 fps but here 20-40
And how to fix this? bug