PostgreSQL is a popular open-source relational database management system (RDBMS) that is known for its scalability and performance. However, as your database grows and your queries become more complex, it is important to optimise postgresql query to ensure that they are executing as efficiently as possible.

Here are some tips on how to optimise PostgreSQL query performance:

1. Adding Index
2. Creating Partitions
3. Adjust Auto-vacuum parameters
4. Reindexing tables
5. Using Materialize view

Checkout full detail and benchmarks here.