Send Email step is taking too long to send a zip file.
Currently, on one of our workflows we have configured so a zip file with attachments files is generated in the payload directory:

The attachments folder contains the attached file it could be a word file or pdf file, and then a zip file is generated with the attached files.
In the workflow is configured the send email to send the attachmentFolder.zip and the rejected7835.pdf file, as you can see down below:


I initially thought it was a size issue, that the zip could be too large I got the email with the attachment 15 minutes after it was triggered in the send email step, and got a zip file with the size of 13kb.
Maybe there are some best practices that I'm missing here to counter the delay time.