Alongside this, a new 'Idle Worker Process Page-Out' configuration option has been added to application pools to instruct Windows to page-out the process if it has been idle for the idle time-out period (by default, 20 minutes). To improve scalability, if IIS is configured with 100 or more web sites, by default it will not automatically start any of them.
The following features are introduced in Windows Server 2012 R2:
