Back/Forward Cache (bfcache)
The back/forward cache (or bfcache) is a browser optimization that enables instant navigations when a user clicks the back or forward buttons. It works by storing a complete, frozen snapshot of a page in memory—including its JavaScript state—when a user navigates away. If the user returns to that page via the back/forward buttons, the browser can restore it immediately from memory, providing one of the fastest possible page load experiences.
Related web performance terms
- Backend
The backend refers to the server-side components of a web application that are not visible to the end-user. This includes the web server, application logic, and databases.
- Backend Cache (AWS)
This is Speed Kit's central, primary cache where Anonymous HTML and other website assets are stored. It is hosted on Amazon Web Services (AWS), a secure and highly reliable cloud computing platform.
- Backend Time
Backend Time is the duration it takes for a website's Origin Server to process a request and generate the HTML for a page.
- Baseline
Baseline is a standard that indicates when a web platform feature is broadly supported and safe to use across all major browsers.