Good grades, slow loading speed

Hi all !

First time posting here. I’m just wondering why all my websites have great grades but are so slow to load ?

It’s a WIX website : www.topgrass.dk

Here’s the latest test : https://www.webpagetest.org/result/180507_63_17034fd3665d20d65a05332fb711247d/

6.760s to load

Any ideas as to what might be causing the delay ?

Thanks !