It turns out that nginx(engine-x) servers are behind the extreme speed I saw last night.
I accessed the same web site and with my download manager once again peaked at 30kb/s, a sustained throughput of 20kb/s.
Without the use of a download manager, I only got a speed of 9kb/s.
Ngin-x is the 4th most used server at the moment.
Ngin-x w32 is available, I installed it without any appreciable results.