This can greatly improve the speed of your website, and provide lots of other benefits without you needing to do anything.
CDN's have been part of the Internet for more than 20 years, and most web content is now delivered using them, including major streaming services like Netflix, Amazon Prime Video and Apple TV+.
They work using a simple principle - by storing (or ‘caching’) multiple copies of your site at key locations across the Internet, they move your content physically closer to your audience. This reduces the distance it needs to traverse, speeding up its delivery.
The obvious one is the additional cost to your hosting package to get access to a CDN, but given the huge benefits they provide to your site visitors, this cost should be considered very good value. This is particularly true if your site features lots of video, images or complex functionality that could make it slow to load on the first visit, driving your audience away.
Another factor to bear in mind is, if your site’s content gets updated regularly, you’ll need to monitor it to ensure your visitors are seeing the latest updates. Remember that CDNs store a copy of your site, so an update to a particular page may take a while to ripple out across the CDN's servers. CDN providers do give you control over what they will cache though, and how long for, so you will have control over how quickly the key content is refreshed.
In summary, CDNs are an essential part of the modern web, where more and more of your potential audience have access to high speed Internet and expect sites to load almost instantly every time. Where available, you should definitely look to take advantage of them to improve your overall customer experience.