Microsoft® Windows Server™ 2003 White Paper
It is probably a good idea to switch this setting to Adjust for best performance on a server just to make sure it stays that way.
The Advanced tab allows you to have some control over the processor priority and memory as shown below. If you change the processor scheduling from Programs to Background, then equal processor cycles are given to both types of programs (a background program would be a program such as SQL Server™).
The Memory usage setting is already set to favor using the server as an application server.
Implementing a Scalable Architecture24