Does many dns servers around the world improve the response time?

[MontyRee]

Hello, list.


I have some questions about RTT(Round Trip Time) related.
please let me know. 


-.I have operated cache only bind dns server.
  but, where can I find RTT information at my DNS Server?
 

-. If I operating the global web site, is it better to setup lots of dns servers as many as possible(max 13)
   around the world to improve the response time?
 


Thanks for your help.


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