I understand that, by the way, i´m studying Cumputer Engeneering and i´ve learned how the Networks work. But, if that was a general problem, your other sites that you host will be slow as mine, but only mine has that problem... for example, a friend of mine just downloaded the test file at 7.2Kb/s (he has 2Mbit connection). I´m defenetly unhappy with this... Because i have downloaded thousands os files, and browser through international websites and its very fast and i download at the maximum speed of my connection.
Try downloading this file and tell me if you can use the total capacity of your connection.
LINK in normal conditions i would download it at 210Kb/s average, i just downloaded it at 11Kb/s average...