b45f1778_he_Official_Microsoft_IIS_Site__Description
[Attribute] preLoadEnabled [Description] 
Optional Boolean attribute. Specifies that IIS simulates a user request to the default page of an application or virtual directory so that it is initialized. In effect IIS starts the application when the application pool is started without having received a request. This increases performance by performing initialization tasks such as loading managed modules and compiling managed code. No log is generated in the IIS logs. The application pool's startMode setting must be set to AlwaysRunning. The default value is False.
Application for a Site <application> : The Official Microsoft IIS Site
Description