Here you can find several kinds of cobweb meshes and materials for any case.
This package is a part of Undeground bundle (save 50%)
Support, URP and HDRP shaders are here:
Triangle counts:
Cobweb strips - 32 tris
Cocoons - 404 tris
All usual meshes - 1742 tris
All simple meshes - 84 tris