There are a lot of per-query optimizations that can be done, and I think I have read somewhere that Hasura does them very aggressively, ensuring performance eve

There are a lot of per-query optimizations that can be done, and I think I have read somewhere that Hasura does them very aggressively, ensuring performance even on complicated queries. In any case, you won't have to worry about N+1 Query problems with Hasura.