I have problem with send many email when created node. Currently, I'm using smtp to send mail. Time to send a mail about 3-4s.

I'm using hook_node_insert to do this action. But when I need to send about 10 mail, I need waiting about 30-40s to redirect create form to the new node. It's very slow.

I tried use event KernelEvents::TERMINATE like this article, but result is same. So what is the way, can I created node completely, redirect to new page. Finally, I will do action send mail. Hown can do that? Any suggestion.

Note: I don't want create queue and waiting to next run cron to send mail. Because mail need send instantly after created the node

I'm using SMTP module to send e-mail messages after creating nodes. It takes about 3-4 seconds to send each such message using hook_node_insert. So if I want to send 10 messages, then I have to wait for 30-40 seconds for the iteration to complete and then only I get redirected to create new node. It's very slow.

I tried use event KernelEvents::TERMINATE per this article, but it did not speed up the whole process.

Is there a way just to complete creating a node without waiting and immediately proceed to creating a new node, while sending e-mail messages at the same time?

Note: I don't want to create queue and wait for the next cron run to send e-mails. Because e-mails need to be sent instantly after creating respective node