@renluop - am unable to say.
But there are some interesting statistics to be had outside the main result page. The page about your ISP (or your own AS, or IPs in a range that matches a certain domain name) is interesting reading as it shows the variation between users of that AS or domain.
For example AS20712 (my ISP, A&A, was matched, I don't have an AS of my own) showed bufferbloat distribution of roughly 33% grade A, no B (!), 30% C, 30% D, few E and virtually no F, iirc. F is the worst. Which tells me that A&A is not all bad.
Mind you, Crazyteeka scored an A or A+ iirc, and he has the same hardware and ISP. So it's either BT or some differences in the protocol stack for FTTC vs ADSL1/20CN/PPPoEoA or something I can't think of concerned with the huge speed differences between us, or because Ive got my Firebrick misconfigured.
(Latter quite poss, not sure about the us load splitting config and the stupid need to manually guess the traffic shaper rate values, which differ between lines and worse could in theory change from hour to hour.)