I continued experimenting with the Geometry nodes on animated characters:
Something I noticed is the “Mesh to Curve” seems suspiciously slow. On a mesh with 30k points, it runs at about 0.57 fps. I had to replace the character to share an example file, hopefully it helps out:
https://www.dropbox.com/s/yrhqqdl1wzogb9h/mesh2wire_slow.zip?dl=0