SO when you pay for that service it says something like "up to 75mbps" which in reality means that the speed test and google's home page could see that much speed and everyone else will look like dial up from the 1990's.
I have a suggestion.... Web browsers should take some measurements and display prominently in a visible status bar or other location.... average TCP throughput --- And Estimated average bandwidth;
Both a "this site" value, a "this browser session" value, and (Optionally) if the user decides to share their numbers, Community average bandwidth for this site, Community average bandwidth for this ISP, and Community average for this site on this ISP.
If Community average for this site on this ISP is more than a standard deviation below Community average for this site,
Then a little warning exclamation point should appear to the right of the browser bar. On mouseover, and for a few seconds after loading the page, a little warning bubble should appear for a few seconds. "Your internet service provider seems to have below average performance in loading this page."