TrueNet tests show Domain Name System (DNS) responses for all TelstraClear probes were very slow, resulting in poor webpage loading times. 

[The following chart shows the DNS response times of all TrueNet volunteer probes grouped by ISP over a 12-day period.] Most ISPs provided DNS responses within 20-30 milliseconds, but TelstraClear DNS response was taking over 1000 milliseconds (1 second) during the affected period;

Our TelstraClear probes are mostly Wellington and Christchurch cable connections, but one 100Mb/s cable and a DSL probe in Auckland with the same issues suggests it was a national problem.