I did, however, create a new collab plugin based on commits from this Google Wave white paper: https://svn.apache.org/repos/asf/incubator/wave/whitepapers/... , and wrote about it here https://stepwisehq.com/blog/2023-07-25-prosemirror-collab-pe... . Anyone needing more performance out of ProseMirror collab while sticking with traditional steps/transactions may find that information useful.