How to Monitor Core Web Vitals Over Time
Learn why Core Web Vitals should be monitored continuously and how to detect performance regressions after deployments, redesigns, and content changes.
Why One-Time Performance Tests Are Not Enough
A website changes continuously. Developers deploy new code, editors publish content, marketers add scripts, databases grow, and infrastructure changes. A page that performs well today can regress after a seemingly unrelated change.
What Should You Monitor?
LCP
Track changes to loading performance and investigate pages where important content starts appearing later.
CLS
Watch for unexpected layout changes caused by new components, images, ads, fonts, or injected content.
INP
Monitor responsiveness and investigate changes that coincide with heavier JavaScript or third-party services.
Set a Baseline
Record performance before significant deployments or redesigns. A baseline makes it easier to identify whether a change improved or degraded performance.
Monitor Important Pages
Start with your homepage, landing pages, high-traffic content, conversion pages, and other URLs important to your business.
Use Monitoring With Audits
Monitoring detects changes; an audit investigates them. Both are useful parts of a performance workflow.
Read our continuous monitoring guide for more on this approach.
Conclusion
Continuous monitoring turns performance from a one-time project into an ongoing engineering practice. The goal is not to chase a score every day, but to detect meaningful regressions early.