From: David Ahern <redacted>
Date: Wed, 2 May 2018 09:37:21 -0600

To share numbers from recent testing I did using Vincent's modules,
lookup times in nsec (using local_clock) with MULTIPLE_TABLES config
disabled for IPv4 and IPv6

            IPv4    IPv6-dst    IPv6-fib6
baseline     49        126         52

I have other cases with combinations of configs and rules, but this
shows the best possible case.

IPv6 needs some more work to improve speeds with MULTIPLE_TABLES enabled
(separate local and main tables unlike IPv4) and IPV6_SUBTREES enabled.

Yes, like for ipv4 sharing local and main tables will help a lot.