Gets or sets the minimum number of threads that must be free before a request for resources in this configuration scope can be serviced.
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The HttpRuntimeSection.MinFreeThreads property defines the minimum number of free threads to execute a request. If a sufficient number of threads are not available, the request will remain queued and periodic checks for thread availability will continue until the required amount of threads are present. The default value is 8.
ASP.NET keeps this many threads free for requests that require additional threads to complete their processing.