Massive lag when worlds are over 500mb

When playing a world that reaches over 500mb there is massive lag experienced by the user. This is when graphical settings are on the lower end, and using a well-specced machine. This is most often triggered when travelling by boat, but happens when moving on foot too.

Suggestion that an advanced option be given to users that allows larger worlds to be held in RAM for those users with enough memory to spare.

The game doesn't seem to use the GPU properly either.

Comp specs
i5-7500
16gb RAM
Nvidia 1050ti G1 4GB
Samsung Pro SSD