I'm a member, and have been using the Domain Mapping Plugin

Hello,
I'm a member, and have been using the Domain Mapping Plugin for Multisite on my Multisite network.
This site: Youngsight.com has been going very slow, and when I used a plugin called "P3 Profiler" is showed that the domain mapping plugin is taking up 30% of my load time.
I would like assistance with this as this site is getting lots of traffic, and we are getting a lot of complaints about it loading slow.
Here are screen shots:
http://youngsight.com/wp-content/uploads/sites/2/2014/12/Screen-Shot-2014-12-24-at-9.48.28-PM.png
http://youngsight.com/wp-content/uploads/sites/2/2014/12/Screen-Shot-2014-12-24-at-9.46.42-PM.png
http://youngsight.com/wp-content/uploads/sites/2/2014/12/Screen-Shot-2014-12-24-at-9.45.26-PM.png
Any help would be great!!!
Thanks,
Victoria