9b02b119_he_Official_Microsoft_IIS_Site__Description
[Attribute] dynamicRegistrationThreshold [Description] 
Optional uint attribute. Specifies the lower limit of dynamic site activation. When the number of configured Web sites on a server exceeds the value of this attribute, the service will not activate all of the sites when the service is started. Instead, IIS will activate each site when it receives the first request for the site. When the number of configured sites is less than or equal to this number, all configured Web sites will be activated when the service is started. The amount of system resources required by IIS is lower when sites are activated individually, especially if a large number of the sites is accessed infrequently. The first request to the site may take more time as the site is activated, but subsequent accesses will respond normally. The default value is 100.
Web Limits <webLimits> : The Official Microsoft IIS Site