IIS 6.0, when running in worker process isolation mode, offers several features that you can use to better manage your systems' resources and to help maintain healthy and robust systems:
Configure Web gardens.
Configure idle timeout for a worker process.
Configure startup and shutdown time limits.
Enable CPU monitoring.
Assign processor affinity.
In worker process isolation mode, you can configure an application pool to be supported by multiple worker processes. An application pool that uses more than one worker process is called a Web garden. (Web gardens are to be distinguished from Web farms, which use multiple servers for a Web site.)
Web gardens can reduce contention ...