>> Spgist index tree is much better than gist - 12149 pages vs 1334760 !
I assume this is the reason why it is bigger. IP addresses are very
well suited to SP-GiST. They naturally do not overlap.
> I also noticed, that spgist is much faster than gist for other inet
> operators. I'd like to see in 9.6.
Unfortunately, I missed the deadline of the last commitfest. It is on
the next one:
https://commitfest.postgresql.org/10/571/