The domain name system (DNS) is one of the cornerstones of the web. Without DNS lookups, it would be impossible to know which domain corresponds to which IP address (the location where a website's files are hosted). As it is, these lookups can happen in milliseconds, allowing you to jump from website to website almost as quickly as you can click on a link.
Reducing the number of DNS lookups can help keep your website loading times in check. It's a simple process you can undertake in a number of ways, but it can have a significant positive impact on the user experience.
Below, we'll go over the basics of DNS lookups, how they work, and how to measure response times. Then, we'll discuss how to reduce DNS lookups in WordPress.
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