Slow processing orders because of this plugin

Hey, I have problem with your plugin while placing the order that this plugin slows down drastically placing/processing order … it adds around 6 seconds to processing time. I think its basically because emails are being sent in this call and blocking the woo process. My suggestion is somehow make the scheduling of emails and processing them in background.

(Yes I confirmed the plugin is problem because when I disable it, processing order lasts 1-2sec, not 8s+)

Thanks for looking at it …