A CDN, or content delivery network, serves some website assets from locations closer to visitors. It is most useful for static files such as images, CSS, and JavaScript.
What a CDN Can Do
It can reduce load on your origin server and improve delivery for visitors far from the server.
What It Cannot Do
It will not fix slow PHP, poor database queries, broken plugins, or a badly configured checkout.
Be Careful With Dynamic Pages
Do not cache account pages, baskets, checkouts, or private content unless the application supports it.
DNS Considerations
Some CDN setups require nameserver changes. Preserve email and verification records when changing DNS.
A CDN is a useful layer, not a substitute for a well-built site.
