On the test domain and hosting everything worked fine. The request passed in half a second.
After transferring to the domain and hosting the client, the request began to go away for a very long time. The maximum time I saw was 7.5 minutes.
Made a console screen and measured the script execution time:
The code for sending the form will be deleted if necessary, but it has not changed, so I think this is not the case
Write hoster or all the same problem on my side? Thank you in advance!

add.phpwhat does? - Visman