Lighthouse is a lab tool [1] for testing the performance of web pages. It specifically helps you measure your Core Web Vitals [2].

There are many, many research and case studies [3] correlating improved website performance to improved business metrics (such as conversions).

Google Search has also signaled that the Core Web Vitals will become a ranking signal [4].

Disclosure: I work on Lighthouse and web.dev

[1] https://web.dev/how-to-measure-speed/#lab-data-vs-field-data

[2] https://web.dev/vitals/#core-web-vitals

[3] https://wpostats.com/

[4] https://webmasters.googleblog.com/2020/05/evaluating-page-ex...