WordPress is one of those CMS’ that, because of their rich features and flexibility, depend on many external resources like plugins or analytics tools. Loading those resources of your website can slow down your pages, because the browser fetches every file from a single server. The more files (and data) is exchanged between browser and client, and the bigger the files sent, the slower your website gets.
A Content Delivery Network is a powerful service that loads and stores your website and its assets (scripts, images, and others) in a globally available cache.
Whenever a visitor opens one of your pages, the browser will look for the geographically closest cache (“Point-of-presence”) and deliver the content from there.
This significantly improves the latency and allows the browser to show your page much faster.