Run btspeedtester and when first test completes then run diagnostic test and post results rather than links
Unfortunately as you have a hh3 and modem there are no meaningful stats unless you have an unlocked modem
Are you connected wired or wireless?
ok, I've done the BT speed test, twice and the results are interesting... beautiful 75Mbps dl when I do exactly as the test asks, hard wired into the hub.
but back to 4.8 Mbps dl when I run the test from exactly the same laptop, seconds later but on Wifi...
Is my old Homehub3 knackered?