Hi,
I doubt that this is an issue with the plugin, but I'll ask anyway if someone might have any tips.
I run a woocommerce store where I'd like the receipts to come from an verified e-mail, thus I've setup SMTP > Google Apps via this plugin.
However, I've noticed that the checkout process, from clicking the confirm purchase button to being redirected to the thank you page, uses about 4 seconds longer when using SMTP mail, than when using the ordinary php sendmail.
PHP sendmail: approx. 4 seconds
SMTP: approx. 8 seconds
Is there some way to remedy this, or is it because of how Woocommerce is written + the connection to Google Apps. My guess is that the user is not sent to the thank you page before the e-mail has been sent, which would implicate Woocommerce. Or it could be 3rd party plugins of course.