What is Performance budget?
The short answer
A performance budget is a set limit, such as total JavaScript size or LCP time, that a site is not allowed to exceed, checked automatically before release.
Performance budget, explained
Budgets stop slow creep: every new feature has to fit, or something else has to go.
Questions people ask about Performance budget
What is Performance budget?
A performance budget is a set limit, such as total JavaScript size or LCP time, that a site is not allowed to exceed, checked automatically before release.
Related terms
Page speed is how quickly a web page loads and becomes usable, measured by metrics like Largest Contentful Paint, Interaction to Next Paint and layout stability.
CI/CDCI/CD is automation that checks and ships code: continuous integration runs builds and tests on every change, and continuous deployment releases what passes.
Core Web VitalsCore Web Vitals are Google's three user-experience metrics: Largest Contentful Paint for loading, Interaction to Next Paint for responsiveness and Cumulative Layout Shift for visual stability.
Largest Contentful PaintLargest Contentful Paint measures how long it takes for the largest visible element, usually the hero image or headline, to appear; good is 2.5 seconds or less.
Part of the Web Encyclopedia by Apex Flow Digital. Definitions are general knowledge, kept current, with no invented statistics.