"Myrland has been remade, from the ground up, in a new modern terrain system," Star Vault wrote in a newsletter. "This means not only does the terrain look much better and less jagged, but also performs loads better."
Today's changes mean that players should start seeing faster updates in the future. The patch notes for V1.80.00.03 are up for your perusal.
[Thanks to Dengar for the tip!]