Just-in-time (JIT in PostgreSQL) compilation of SQL statements is one of the highlighted features in PostgreSQL 11. There is great excitement in the community because of the many claims of up to a 30% jump in performance. Not all queries and workloads get the benefit of JIT compilation. So you may want to test your workload against this new [&]

https://www.percona.com/blog/2018/11/19/installing-and-configuring-jit-in-postgresql-11/