Elementtiming API
This is a browser API that allows developers to measure the precise render time of specific, designated elements on a page. Speed Kit can use this to accurately measure the Largest Contentful Paint (LCP) for soft navigations in Single-Page Applications (SPAs), where traditional measurement methods often fail.
Related web performance terms
- ETag
An ETag (entity tag) is an HTTP header that serves as a unique identifier for a specific version of a resource. It is a crucial mechanism for efficient cache validation.
- EXIF (Exchangeable Image File Format)
EXIF is metadata embedded within image files (like JPEGs) that contains information such as the camera settings, date, time, and sometimes GPS location where the photo was taken.
- Early Hints (HTTP 103)
Early Hints (HTTP 103 response status) is a mechanism that allows the server to send resource hints to the browser before the final HTML response is ready.
- Edge Cache (Fastly)
The Edge Cache is Fastly's distributed edge caching infrastructure that serves cached content from Fastly's Points of Presence (PoPs) around the world.