v11.1: DNS Blackhole with iRules

Hi Jason, we had a discussion on the board where a peer has complained about performance problems using this iRule and I've tried to optimize his code. (Link: https://devcentral.f5.com/s/feed/0D51T00006n6oY4SAI) Could you provide additional datails why the enforcement of the $Blackhole_Match happens in the DNS_RESPONSE event and not directly in the DNS_REQUEST event? Cheers, Kai