So I've noticed since I started playing, through Beta and the updates to it, that I get a strange slow down occurring on the maps at the Beach areas and most noticeably where the river delta comes into the sea. I think it might have something to do with how the river flows or something. I haven't seen someone bring it up yet so it could just be me and my laptop experiencing this. The slowdown can be pretty severe, it's not quite a framerate slow down but it seems like the game itself is struggling to move along at a normal speed.
I have turned off the fancy lights and that had improved performance overall (bot that it really needed it but it was a little smoother) but it didn't change anything about those areas. I didn't have the fancy map on at all.