title: domain name vs ip address, same server, but different speed
body: <p>I have two similar sites:
  - two of them have almost exactly the same codes, and running on the same server
  - both sites are the same, they just use different language.
  - database of the slower site is populated (maybe only the user table) the other tables for site content is the same
  - the faster uses root to access database</p>
  
  <p>one of the sites is not released yet, so it uses IP Address to access the site instead of domain name</p>
  
  <p>the site that is using IP address is faster (lot faster)
  the site that is using domain name is slower</p>
  
  <p>do you know why is this happening what could be the reason?</p>