How to Reduce and Speed Up DNS Lookups in WordPress

There are a lot of different optimizations you can make when it comes to WordPress, and some are more important than others. A factor that is often overlooked is the lookup times associated with DNS, and just how much of an impact it has on your site. Just like with TTFB and network latency, it’s an important piece of the puzzle when it comes to calculating your total page load times. So today we’ll dive into a few recommendations on how to reduce DNS lookups and speed them up, why you should, and how it plays a part in the performance of your WordPress site. What is DNS Lookup?
To show you what a DNS lookup is, you need to first understand how DNS works. DNS (domain name system) is essentially the backbone of the internet. A common reference to explaining how DNS works is to think of it like a phone book for the world wide web. Every website and domain you visit are all mapped to an IP address.
When you type Google.com into your address bar, a DNS query is performed by your ISP to request the nameservers associated with the domain. The mapping to the IP address is then done behind the scenes by the server which allows you to then use the domain name to access it. Without
Source: https://managewp.org/articles/15921/how-to-reduce-and-speed-up-dns-lookups-in-wordpress

source https://williechiu40.wordpress.com/2017/08/21/how-to-reduce-and-speed-up-dns-lookups-in-wordpress/