Optimizing TTL values for DYNDNS service

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http://serverfault.com – I've finally gotten my own DYNDNS working but I am looking for some advice on optimizing it. Edit: Basiclly I got a Domain at a registrar that I point to my own nameservers where I keep my own records. I'm using nsupdate to update records. I want users to be able to register, get a subdomain they can point to a device that got a dynamic IP thus making it 'static'. An example of a dynamic update http://ip.seveas.net/dnsgraph/png/client1.epnddns.com/?skip_.=on&show_A=... Basiclly I want to achieve the fastest resolve, if I can call it that. Meaning the least amount of time that a user ha (HowTos)