Reducing DNS lookups to increase speed

It’s actually faster to use the full URL and not a part. The reaosn for this is that DNS requests are cached, by your broswer, PC and the servers between your PC and the internet.

So if you use a full URL, the first requst will need to do a DNS look up, but each subsequent request will use the cached settings.

When you use a part URL the browser has to take the time to work out what the URL will be in relation to the page that it’s on before it sends a requet for the complete URL path anyway. There’s not a huge differnce (users won’t tell any differnce), but it still creates less overhead on pretty much every system to use a full UrL all the time.