Merge pull request #5598 from jonashrem/patch-14

 Add the recommendation for using IP address over a hostname for database config

Author: dobooth

_includes/install/web/install-web_2-db.md

@@ -10,7 +10,7 @@
     </tr>
   <tr>
     <td>Database Server Host</td>
-    <td>If the web server and database server are located on the same host, enter <tt>localhost</tt>. If the database server is located on a different host, enter its fully qualified hostname or IP address.</td>
+    <td>If the web server and database server are located on the same host, enter <tt>localhost</tt>. If the database server is located on a different host, enter its fully qualified hostname or IP address. Using the IP address is preferable since using a hostname can cause additional time on each request for DNS lookup.</td>
   </tr>
   <tr>
     <td>Database Server Username</td>