Some other people ran the benchmarks from different places in Europe and got similar results with "nothing significantly different" from those published: https://news.ycombinator.com/item?id=22900649
SourceHut is still the winner of most, but GitHub is a lot faster than in the report on forgeperf.org.
I think the perceived speediness of GitHub for me can be mostly attributed to the fact they don't trigger a full page reload for every navigation. Whereas SourceHut is rendered completely server-side AFAIK.
(I meant GitHub in my previous comment, fyi.)
Edit: see "Expand for details on methodology" right at the top of the page.
Anyway, it suffice to use gitlab, github, bitbucket and sourcehub for a few seconds to notice the slowness of the three first sites compared to the last one.
We didn't really need the numbers to be convinced but I hope they will produce some pressure to be faster.