Performance Budget

Definitions

1. A set of quantitative limits on performance metrics — such as maximum JavaScript bundle size (e.g., 200 KB), total page weight, or time to interactive — that a team agrees not to exceed, often enforced automatically in CI to prevent performance regressions.

   In plain English: A speed limit you set for your website — if a change makes it too slow or too heavy, the build system flags it before it goes live.

   Example: "The PR failed CI because adding that charting library pushed us 50 KB over the performance budget for the main bundle."

Related Terms

• Hot Reload
• Observability
• SSR
• SSG
• Astro
• Component Library
• Layout Shift
• Metrics Collection