[Hummingbird] How to improve page performances

Hi WPMU team,

Our site: onlydinosaurs.com is on Bluehost. And our site enabled Hummingbird Pro, Smush Pro, MaxCDN. Have no idea why our webpage performance is so slow.

Here's pingdom test result 6.6s :
http://prntscr.com/k7u3p3 , http://prntscr.com/k7u3u1 , http://prntscr.com/k7u3wa
Google Page Speed Test screenshot:
http://prntscr.com/k7u65p, http://prntscr.com/k7u6hi

Test Page: https://onlydinosaurs.com/features/walking-dinosaur-costume/

Our site support access is granted. Please can you look into our site. And advice where is the problem? So we can start to work on it.

Thanks in advance,