OK, so you use the same application every time you login. So, you are wondering, how do I start that application so that it is already running when I start up? Easy, create an entry in the Session manager so that it will start on boot. Here is how to do that.

Open Sessions Preferences
Sessions Preferences is a program that monitors applications at startup. You can see the applications that are started by default listed. The first thing you should do is to turn off some of these applications that you do not use. This will increase your boot time, slightly, and it will save on system resources. For example, if you do not run Bluetooth, uncheck it so that it does not run on boot time.