Support for high refresh monitors without affecting the game's speed.

[Ralsi]

AFAIK there's no way to uncap your FPS in-game since the game's animations are locked to 30/60 FPS, but i think there's a solution for that

Games like Terraria and PVZ have a very big modding community and they've come up with mods that uncap the game's refresh rate cap to use the max rate that your monitor supports, e.g. the High FPS Support mod for Terraria that allows rendering the game at above 60FPS without affecting the speed of the world's simulation, game looks far more smoother and you don't have to add any new frames for the sprites  Hopefully Klei will consider adding this into the next update.