FYI if your server is set up to handle it's own DNS, usually Bind (the named process you see on the server) is the software responsible for your DNS management. Now there are ways to increase the reaction time but it will probably only be noticible with hundreds of recursive clients. You (or your server admin) can look into TinyDNS, it's light-weight so consumes less memory and supposed to be faster. Google Bind VS TinyDNS.
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