Postgresql uses a process per connection model and it has no way to serialize a query plan to some form that can be shared between processes, so the time it takes to make the plan including JIT is very important.
Most other DB's cache query plans including jitted code so they are basically precompiled from one request to the next with the same statement.
Most other DB's cache query plans including jitted code so they are basically precompiled from one request to the next with the same statement.