Accodring to these rough benchmarks, it's faster to use arrays rather than joins: https://shon.github.io/2015/12/21/postgres_array_performance.html https://sho

Accodring to these rough benchmarks, it's faster to use arrays rather than joins: https://shon.github.io/2015/12/21/postgres_array_performance.html https://shon.github.io/2015/12/21/postgres_array_performance... https://gist.github.com/joevandyk/031cf5812bd656887623 https://gist.github.com/joevandyk/031cf5812bd656887623 To search for a post with multiple tags, you need to do a join for each tag. You don't have that problem with arrays.