My sandbox is faster than my live site?

Hi
I was working with Patrick on this (he is fantastic by the way!) and I got kicked out of the system, when I came back I couldn't connect back to our chat. We finally decreased the speed of the live aveseena.com site to 5.9 sec but sandbox is at 3.8 seconds. How can we make live site as fast as sandbox with Hummingbird. I would be very happy if you could help me
Here is the gtmetrix info https://gtmetrix.com/compare/x1uC9zzK/zG4iQOlC Thank you