Experimentation of the New Geometry Nodes Feature in blender.
This was done in the 3.1 version of Blender.
Created on a laptop ( 16Go Ram, RTX3060)
Feel free to download the Gemetry Node Setup here : https://www.dropbox.com/s/axi0ktcx2odgd84/001_SubdivSplineFilling.blend?dl=0
There is a setup for the subdivision and another for the Spline filling effect.
Make sure you are opening the file in Blender 3.1