Web Performance

Web performance is not one score or one browser test. It is the time and work between a person asking for a page and that person seeing useful content, interacting with it, and getting a stable result.

Your users experience a chain. A request reaches an origin or cache. The browser receives HTML, discovers resources, fetches them, builds a page, runs JavaScript, lays out pixels, and handles input. A problem in any link can make the page feel slow.

The job is to find the limiting link for real users, change it, and prove that the experience improved. A perfect result from your laptop is evidence about your laptop. It is not evidence about a phone on a congested connection.

The three user outcomes

Core Web Vitals describe three outcomes that apply across web pages: loading, interactivity, and visual stability.