Feeling good with your Lighthouse score of 100%? You should! But you should also know that you’re only looking at part of the performance picture. Learn how Lighthouse scores are measured differently than other tools, the impact that has on measuring performance metrics, and why you need real-user monitoring for a complete picture.

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While Google Lighthouse is a powerful and convenient tool for assessing website performance, it provides an incomplete picture as it relies on simulated data. For a more accurate and comprehensive understanding, it's important to incorporate tools that use real-user data such as those integrating Chrome User Experience Report (CrUX) and real-time user monitoring (RUM) services like DebugBear.

Why Optimizing Your Lighthouse Score Is Not Enough For A Fast Website — Smashing Magazine

It Doesn’t Impact Core Web Vitals Scores