I have raised the question a month ago here
I need to come back to this. We still have this issue. EE 5.3 with Publisher (but only one language at use for the moment). The website did run for about 10 days without any issue (it was copied from a developer space to the live-domain). All of a sudden when saving some of the edited entries it takes minutes to save them back so that we encounter a Request Timeout. We checked with the hosting company, they do not see what happens and no errors are logged. We have enough memory and we could remove the Timeout with the htaccess. It takes 4 to 6 minutes on some of the entries to be correctly saved.
We have no idea why EE takes that long for an entry save? There are no relationship stuff in those entries that take that long. There are no Bloqs fields in those entries. Some of the Bloqs field entries do save normally.
I have installed a copy of the site on an other server to check if we get any difference. It has the same behavior on this copy. The same entries do take minutes to update.
Is there someone who can help us to investigate and solve the problem? How could we make visible what EE is trying to do in this long time? My customer and I are getting a bit nervous now.
Some help is really appreciated.