Cache-Control
Cache-Control is an essential HTTP header that dictates the caching policy for a resource. It contains directives (e.g., max-age, no-cache, no-store) that instruct browsers and intermediate caches (like CDNs) on whether, how, and for how long a response can be stored and reused. Dynamic e-commerce pages often have restrictive Cache-Control headers (like no-cache) that prevent traditional caching, which is a core problem that Speed Kit's Dynamic Caching is designed to solve.
Related web performance terms
- CDN (Content Delivery Network)
A CDN, or Content Delivery Network, is a globally distributed network of servers designed to deliver web content to users quickly and efficiently.
- CORS (Cross-Origin Resource Sharing)
CORS is a browser security feature that uses HTTP headers to manage whether a web page from one domain is allowed to fetch resources from another domain.
- CPU time
CPU time is the amount of time the Central Processing Unit (CPU) of a user's device spends processing the scripts and rendering a webpage.
- Cache
A cache is a high-speed, temporary storage layer designed to store copies of website files (like HTML, images, and scripts) closer to the user.