Labels not working when replying to a comment

When you reply to a comment, no messages (Posting your comment. Please wait, etc.) are displayed. The comment appears after a few seconds.

Messages are displayed for replies to the blog post.

By the way, comment posting is slow. It might be better to display the comment immediately rather than wait for the server’s response. I don’t know how to do it, but comment posting in BuddyPress is much faster.