Add note about ANALYZE after Postgres database importing

docs/importing-postgres.md

@@ -32,7 +32,7 @@ just run-tags import-postgres \
 
 - `SERVER_PATH_TO_POSTGRES_DUMP_FILE` must be a file path to a Postgres dump file on the server (not on your local machine!)
 - `postgres_default_import_database` defaults to `matrix`, which is useful for importing multiple databases (for dumps made with `pg_dumpall`). If you're importing a single database (e.g. `synapse`), consider changing `postgres_default_import_database` accordingly
-
+- after importing a large database, it's a good idea to run [an `ANALYZE` operation](https://www.postgresql.org/docs/current/sql-analyze.html) to make Postgres rebuild its database statistics and optimize its query planner. You can easily do this via the playbook by running `just run-tags run-postgres-vacuum -e postgres_vacuum_preset=analyze` (see [Vacuuming PostgreSQL](maintenance-postgres.md#vacuuming-postgresql) for more details).
 
 ## Troubleshooting