The service you receive depends mostly on your specific location. A lot of neighborhoods have a cable line going through their street and is split to each house, which weakens the strength of their internet connection (if you use cable). So often your service may be slow if there are a lot of houses on the same cable line as you. Also it could be that you are paying for the least amount of bandwidth, the more you pay the faster it will be. I am not an expert, that that is my understanding of how it works.