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I can tell you that the router is probably not the problem.
Usually DSL speeds are quite slow.
And this will most likely be the problem.
Router speeds are based will be effected by your Internet providers speed which in this case appears to be 1.5 Mbps down and probably 256k up.
I will say that cable speeds will generally be faster and more reliable.
Most cable company minimum speeds start at 3Mbps down and either 768kbps up or 1Mbps up.
Is there anyway to be sure that the router is not keeping me from getting maximum speed provided from DSL?
Does this help to undrerstand the issue?
You can either buy another router and set it up and test then return it or...
You use two computers that are set up on the network and move a 12.5MB file and see how long it takes
But being that I am a Network Administrator and Cisco certified, I can 99.9% guarantee you that it is service related not router related.
What will the 2 computer test results tell me?
That test with a 12.5 MB file is = 100 Mbp
Your router should be rated at no less than 54Mbps
So it should take about 2-5 seconds to transfer the file.
If its any longer than that there is a problem with the router