Fastest DNS Resolver

Hi

i have a server/site that useing a lot of dns resolver !
first i used LT dns resolver server but every few seconds it showing timeout !
so i used my own dns resolver , but randomly it showing timeout ! and when cpu load is a little high , 50% of requests showing timeout Fastest DNS Resolver

i wana know how can i have fastest dns resolver ? and how can i set my server to cache dns's !?

thanks

 

 

 

 

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