So i think this is only for dose in sweden dont trust tp-test to mutch.
ISP are evil bunch just wants your money
tptest contains some "reference-servers" by default.
And those servers are on a couple of different isps.
And here some isps configure in their routers so all traffic to the tptest-port gets routed to a local tptest-server
where they put aliases for all the realserver-ips on the loopback-interface
So when all those customers are testing their speed against alot of different tptest-servers on the internet they are just being routed to the isps local one.
And always get topspeed