This is also the wrong question because the load of a query can vary drastically based on the query's structure/complexity, the size and types of the data, and which indexes and tables are used.
The right question is - discuss a problem you'd like to solve using PostgreSQL and find people who have solved similar problems.
Thank you for pointing that out, I agree. I'm just looking for peoples' experiences with their applications, which of course all have different workloads.
People did get the spirit of the question and have provided helpful responses, including context about their query structure/complexity.
