Very slow ajax

Hi,

We have contact forms on our site and when we run site speed tools, there are a series of contact form 7 ajax calls which seem to be very slow (even when CF7 isnt used on the page being tested!!)

https://tools.pingdom.com/#!/d2ZiH/https://www.shapecast.com

Any idea what causes this poor performance and what we can do about it?

Thanks,

WR