The new update (when snow was introduced) make the surface have low framerate. Especially after teleporting back. The lower you get, the better the framerate. Running an RTX 3060ti, not a potato, but not NASA level graphics card.

Working on this, update today should bring triangle count down a bit.

I've made a culling system for the voxel world, going from ~9 million drawn triangles on average to ~1.6 million in the spawn area. This will raise the average frame rate. although the bug you describe when teleporting from a lower level to spawn causing a frame drop still happens, I'm investigating the cause of this, its probably vis related in some way.