Today I Learned - Rocky Kev

TIL lighthouse scores are simulations, not real world

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TAGS: seo devtools

When you run lighthouse:

The fact that RUM data is used, is an important distinction because some of these metrics (FID excepted) are available in synthetic or “lab-based” web performance tools like Lighthouse that have been the staple of web performance monitoring for many in the past. These tools run page loads on simulated networks and devices and then tell you what the metrics were for that test run.

So if you run Lighthouse on your high-powered developer machine and get great scores, that may not be reflective of what the users experience in the real world, and so what Google will use to measure your website user experience.

REFERENCE:
An In-Depth Guide To Measuring Core Web Vitals

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