There are several processes running in the system at a specific time and Windows automatically sets the priority of each process.
Priority to any process can be set using the Task Manager however it will be till the process gets completed and if you run the process again it will start again with the default priority.
So if you want to save some priority to a process, a tool called Prio (Priority Saver) comes to rescue. This compact program allows you to save the priority you specify for any process.
1. Start the Task Manager
2. Right click on the process and select set priority
3. Set the priority you want
4. Just clisk Save Priority
The process will run with the same priority each time.