caching system to differentiate content, the URL/GET-request, isn't correctly varied by appending user-specific tokens/keys to it. Dynamic cache control has more options to configure caching, such as cookie-based cache control, that allows serving content from cache based on the presence or lack of specific cookies. A cookie stores the unique identifier-key of a logged-in user on their device and it's already implemented for authenticating users upon execution of any page that opens a session, in a dynamic caching system, the caches are referred to by URL as well as the cookie keys, allowing to simply enable serving of default caches to anonymous users and personalized caches to logged-in users (without forcing you to modify the code, to make it append additional user identifiers to the URL, like in a static caching system). Prefetching If personalized content cannot be cached, it might be queued on an edge device. This means that the system will store a list of possible responses that might needed in the future, allowing them to be readily served. This differs from caching as prefetched responses are only served once, being especially useful for accelerating responses of third-party APIs, such as advertisements. Route Optimization Route optimization, also known as "latency-based routing", optimizes the route of traffic between clients and the different origin servers in order to minimize latency. Route optimization can be done by a DNS provider or by a CDN. Route optimization comes down to measuring multiple paths between the client and origin server, and then recording the fastest path between them. This path is then used to serve content when a client in a specific geographical zone makes a request. Relationship with Front-end Optimization Although Front-end Optimization (FEO) and DSA both describe a group of techniques to improve online content delivery, they work over different aspects. There are overlaps, such as on-the-fly data compression and improved cache-control, however, the key differences are: FEO focuses on changing the actual content, whereas DSA focuses on improving content delivery without touching content (i.e. DSA has verbatim delivery of content). DSA focuses on optimizing bit delivery across the network, without changing the content while FEO aims to decrease the number of objects required to download websites, and to decrease the total amount of traffic. This can be done by device-aware content serving (e.g. dropping the quality of images), minification, resource consolidation and inlining Because FEO changes the actual traffic, configuration