Adding 'Optimizing PostgreSQL settings' sub-section.

README.md

@@ -182,3 +182,22 @@ _A panic typically means something went unexpectedly wrong. Mostly we use it to
 
 For most applications this performance difference simply isn't something that you need to worry about. In real terms, we're talking about a few thousandths of a millisecond - and the improved readability of responses is probably worth this trade-off.  
 But if your API is operating in a very resource-constrained environment, or needs to manage extremely high levels of traffic, then this is worth being aware of, and you may prefer to stick with using **json.Marshal()** instead.
+
+#### Optimizing PostgreSQL settings
+
+The default settings that PostgreSQL ships with are quite conservative, and you can often improve the performance of your database by tweaking the values in your **postgresql.conf** file.
+
+You can check where your **postgresql.conf** file lives with the following SQL query :
+
+``` postgresql
+$ sudo -u postgres psql -c 'SHOW config_file;'
+----------------------------------------------
+/etc/postgresql/15/main/postgresql.conf
+(1 row)
+```
+
+To read more about PostgreSQL optimization :  
+https://www.enterprisedb.com/postgres-tutorials/how-tune-postgresql-memory
+
+To generate suggested values based on your available system hardware, you can use :  
+https://pgtune.leopard.in.ua