The thread-pool element configures the number of threads used to process requests and the maximum number of HTTP connections that the server queues. For more information, see thread-pool.
The keep-alive element configures the HTTP keep-alive connection management. For more information, see keep-alive.
The file-cache element configures file caching. The dns-cache element configures the DNS caching. The acl-cache element configures the authentication credential caching. For more information, see file-cache, dns-cache, and acl-cache.