Speedtest.net defaults to multi-threading. Simples.
On most devices you can change it to single thread, just under or to the side of the large GO button. See what that gives.
Edit: Oops, I hadnít noticed your actual tbb graphic. Whatís the problem, other than the tbb multithread is faster than the other. Suggesting the other may have a server capacity problem.
Your links to Speedtest.net in your sig just take us to do a test, not to your results.
My broadband basic info/help site - www.robertos.me.uk.
Domains, site and mail hosting - Tsohost
Connection - Three 4G, tbb tests normally 35-45Mpbs down, 65Mbps off-peak, 9-24 up.
"Democracy means simply the bludgeoning of the people by the people for the people." Oscar Wilde
Edited by RobertoS (Sun 17-Nov-19 13:22:03)