What you are seeing happens with all types of connections my self I have cable with a capability of 700Kb download allot of times when I first start Downloading it will be 800Kb but quickly will drop to 650 to 700 This happens when I am DL from Microsoft or any software company's That have connections capable of overloading me.

In theory when you first start the download there is a clear channel for which information to travel through. But your ISP will detect the amount of bandwidth and throttle it to where it belongs.

I do not know if this explanation is correct but it is the way it was explained to me.

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A little common sense goes a long way

Later Grandpa