As they said.
Speedtest.net has always given me speeds from 0.5Mb to 6Mb whereas speed.io is usually more accurate. I can see via DUMeter and various other downloading apps that have speed measurements built-in what my real speed is.
As I type this I am downloading from Usenet at 9.1Mb
Paused that, exited and ran speedtest.net. Best of 3
Inaccurate as usual.