if you're on 2.5mbit.. then your max download speed is 320kb/s (it may appear as 1mb/s for a short ammount of time, this is just windows catching up with the speed, it won't go over 320kb/s in reality) the maths.. 1024 (1mbit) x 2.5 =2560Kbits divide by 8 to become kb/s = 320