Why should you optimize for Lighthouse data when your Core Web Vitals are failing?

You should optimize your page based on Lighthouse (lab) data because improvements in these metrics will eventually lead to better Core Web Vitals (field data). Even if your Core Web Vitals are failing while Lighthouse data looks good, focusing on optimizing the lab data is the right approach for long-term improvement. The effects of these optimizations aren't immediate, as it takes approximately 28 days to see the impact of your changes reflected in field data. This lag explains why there might be a temporary disconnect between your Lighthouse metrics and Core Web Vitals scores.