DNS Latency Impact on IPv6

Backstory: ISP with all customers running Dual-Stack, 10% of customer traffic is IPv6

Currently we have our customer DHCPv4 Pool set up to use our DNS Resolvers but do not have our DHCPv6 pools pointed to us, they are pointing to Google’s. The latency delta between the two are around 10ms.

I know that not all of the customers devices are using IPv6 (Smart TVs or older hardware) but has anyone tested out the latency impact on the preferential treatment of IPv6 based on DNS alone?

I’m working to move the v6 pools over to our own DNS anyways, but this has me wondering if this will help to shift the load?

For those who say “who cares”, these customers are CGNAT’d