Kingjohn
(Kingjohn)
5
If the large number of postings is a unresolvable serious problem, we could close the old thread, open a new thread, add a link to the new thread in the last message of the old one and also in the original post.
The OP of the old should also be copied to the new thread….
Then we could continue with the next 19k messages 
It’s no sexy solution, but I am sure everyone could live with it.
Such performance issues are sometimes hard to find and hard to solve…