I have comcast cable for my internet and the advertised speeds are 6Mbps. I am lucky if I get 1.5-3Mbps avg. I actually called them up because I was kept getting consistant speeds of 1.5Mbps. They said I should get around 3-4Mbps but I don't so thats probably the same problem you are having. The ISP's are ripping you off big time.