In the 1.6 update, the trees in town were adjusted so you can't chop them down. To impliment this, the trees break down to the stump and then regrow as the unchoppable ones. That might be what's happening here, and the lag could be the result of all the trees you couldn't see on the map doing the same. I'm not on Switch but I imagine it would struggle a bit with that much to process in one map.