Collabora slow with many comments

Hello, I have found interesting problem: two users worked together in a Collabora document. The document is quite small with 16 pages and ~25.000 characters. On the first 8 pages the users have produced ~60 comments. These comments have slowed down the whole document, sometimes the users where even unable to scroll in the document. After the deletion of all comments the edit of the document was possible as normal.