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If you have a speed of 1.5Mbps. That is your total possible speed. So if you are both downloading that speed is shared between you. With a cable modem for example you can not go beyond the possible speed of the cable modem itself. It doesnt matter about the other parts of the network.
Also check both the Downstream speeds and upload speeds of your connection. If you have an upstream intensive task, a lot of services limit the upload speed significantly. For instance if you are doing FTP upstream to a web page directory you have an even slower rate of speed and less bandwidth.
This is called the the bottleneck theory. In a network, if everything goes through the same device say a cable modem, or a T1 line. The bottleneck limits everything.
Normally a cable modem has some speed that is the maximum. Even if you could go faster than that most cable modems and most every router designed for the cable modems has a 10Mbps port on the Wide Are Network (WAN) side. No matter what happens you will not go faster than your weakest link or bottleneck.
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