A new feature in SharePoint Server2010, resource throttling provides options for monitoring and throttling server resources and large lists for Web applications. This enables you to control resource utilization during peak usage and prevent user activity from negatively affecting server performance.
Resource throttling can monitor such resources as CPU, Memory, and Wait Time, checking resources every5 seconds. Throttling will begin after3 unsuccessful checks. This throttling period will end after a successful check of the resources.