Could be the routing tables on your ISPs DNS are hot trash.
Lookup a YouTube video on how to change your DNS to Google’s DNS…
8.8.8.8
8.8.4.4
It’s conceivable your Internet speed is good, but your bufferbloat score is bad, but that’s a whole new can of worms. (Id honestly go with Google’s DNS first)
http://www.dslreports.com/speedtest
P.S, do a full reboot of your router first too, 90 seconds… off… at the wall
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