Most sites launch fast and slowly get worse. A performance budget turns speed from a one-off project into a standing team agreement.
What a budget looks like
Set limits for the metrics users feel: largest contentful paint, interaction latency and total JavaScript shipped. Make the limits visible in every pull request.
Enforce it automatically
- Fail builds that exceed bundle-size thresholds.
- Track real-user metrics, not just lab scores.
- Review the biggest regressions in a short monthly session.
Culture beats tooling
Budgets work when product, design and engineering agree that speed is part of the definition of done.
