Um, 1mm, maximum edge length. It cost some memory, probably not just for the undo table entry.
Wow, 1mm costs a lot, but it’s smooth!
That’s with flat shading on, too. Drat! I wish I had put an environment map on it while it held that view.
[When creating 3D tetrahedron filled meshes for science stuff, on objects I created in Rhino, and exported, I once used up all 24GB of memory in my computer, under Linux, too, which boots with only 256MB. The mesher I used called the edge value thing “Wire discretization.” If you were going to break up the edge of your curve into segments, how long would you make them, or how long should the edge facets be?]