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Change the taskmgr (and thus netmgr) in a way that it supports fast and slow task queues. The fast queue is used for incoming DNS traffic and it will pass the processing to the slow queue for sending outgoing DNS messages and processing resolver messages. In the future, more tasks might get moved to the slow queues, so the cached and authoritative DNS traffic can be handled without being slowed down by operations that take longer time to process.
