There are a number of factors then that could effect your download speed
:
[list=1]
[*]Your neighbours, who use the same ISP are limiting the bandwidth down your local line.
[*]The rest of your family are using the router at the same time.
[*]The server where your downloading from. If you are using Bit-torrent then it is the seeds your are connected to.
[*]The distance you are from the router.
[/list]
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