Yeap there is! all depends what are you using ?
Your ISP is: Cable, dsl or Fiber ? What dw and up ?
Well you can check your speed and run a test HERE: http://www.dslreports.com/stest this is the best one and see what is your current speed. After you know at what your running.
Then you can tweak your connection using their tools: http://www.dslreports.com/tweaks , you must specified exactly what your ISP is giving you. Just remember what ISP always say "they don't guarantee the speed" they always have this tipical phase of "UP TO xxmb", which means that is UP TO what ever you can get.
Finally you can download DRTCP/IP to change your setting.
Also if you want to go the easy route. Then download yourself a tweak app. I use this one for several features on it
TuneUp Utilities 2006
cheers :D