I've been working on a rather complex terrain shader in Unity for a while...
Video stuttering is due to recording in 4K. I get a solid 60-90 FPS in 4K and 120-180 FPS in FHD (RTX3080). The terrain is procedurally generated and the tri-planar shader takes surface water, ground water, temperature, slope and elevation into account when determining how to render the terrain. The tree shader also reacts to snow and water, aligned to the terrain.