you can speed up your download speed if you have your ports forwarded properly. As far as you upload speed, this is determined by your ISP and there is nothing you really can do to speed it up. There are a few minor tweaks you can do but the results are very minimal, maybe 1-3kbps a sec.
Here is a page that will tell you how to forward a port to your computer from your router. > http://portforward.com/