Lorenzo,
Fantastic. Glad to hear everything's going smoothly now, with a few days left before your launch! Good luck, and let us know if you need anything else. Also, if you haven't already, please consider leaving a rating and review for JFBConnect on the Joomla Extension Directory. It's certainly not required, but very appreciated:
extensions.joomla.org/extensions/social-...ook-integration/7215
Julio,
JFBConnect shouldn't add a lot of load time to your site. Our site, and many others that use JFBConnect, run just fine and are generally not considered slow. If you have a lot of Javascript or other extensions running, adding another one on top can always add a little delay. If you'd like us to look into it further to see if anything is wrong though, please post the URL of a page that you think is slow, and we'll do what we can to give suggestions on how to improve it.
Thanks,
Alex