Once you are familiar with the add-on and you would like to speed up processing of rows just run the add-on in parallel. Open multiple tabs in your browser, start the add-on and make sure you select different ranges of rows you would like to process.

For example you would like to create 600 drafts using the Merge to Draft mode and when you did few tests processing of each row took roughly 30 seconds. So we are somewhere around 300 minutes what is five hours to process all 600 rows.

Let's say we want to have the job done in approximately one hour. Then we need to run it in five parallel tabs in a browser. Open the add-on in five tabs and select different ranges of rows. For tab one select rows 1-120, for the second tab 121-240 and so on.