CDN setup helps when it is integrated correctly with the Joomla site
A good CDN setup can reduce latency, improve content delivery, protect the server, and support stronger SSL handling at the same time. For many Joomla websites, Cloudflare is one of the most practical ways to improve both performance and security together.
But incorrect DNS, SSL mode, cache behavior, or mixed-content handling can create new issues. The aim is to build a correct delivery layer, not just activate a service.