Fix download speeds to be faster?

I am currently using Clear 4g highest rate service which is still almost as bad as dial-up... Anyways, I can start a download going at around 150kbs and it'll slow down, for example. Starts at 121.9kbs, it'll go down by .1kbs at a rapid pace. Any clue on how to fix it? This happens when the downloads are just going without any web pages up too. I am also using Google Chrome