Aside from providing significant protection from a wide range of threats, the Sucuri WAF also acts as a CDN due to its caching capabilities and regional PoPs — often performing even better than dedicated CDNs based on recent tests.
CDNs can significantly help speed up your website by storing and delivering content as close to the browser as possible, using servers dedicated to that task. What’s more, properly configured caching settings are the best defense against DDoS attacks.
Source: Security Feed