Hmm it's very odd, for example when I cURL using this formatter I get:
curl -w "@curl-format.txt" -o /dev/null -s "https://eyesbound.prismic.io/...6c549e9/javascripts/main.js"
time_namelookup: 0.045091s
time_connect: 0.157528s
time_appconnect: 0.388975s
time_pretransfer: 0.389079s
time_redirect: 0.000000s
time_starttransfer: 0.507990s
----------
time_total: 56.735730s
While for example this 5MB test file comes down in no-time.
curl -w "@curl-format.txt" -o /dev/null -s "http://ipv4.download.thinkbroadband.com/5MB.zip"
time_namelookup: 0.030086s
time_connect: 0.078942s
time_appconnect: 0.000000s
time_pretransfer: 0.079021s
time_redirect: 0.000000s
time_starttransfer: 0.129667s
----------
time_total: 2.442349s
Also the forum here or the prismic homepage and api are blazing fast - just that one page. Turning Adblockers on/off doesn't make a difference 
Are you using some global cdn or something? I'm in central europe, maybe something reroutes me to some very remote datacenter instead of using a local?