I’m sculpting a mesh with about 150k vertices. While sculpting itself works fine, the undo operation (CTRL+Z) takes a very long time (several seconds per undone modeling stroke). Currently this is not really usable, as sculpting (at least for me) involves lot of experimentation and thus a lot of undos.
It would be great if a blender 2.8 dev could look into this. I really like the changes to the sculpting tools in 2.8 overall.