In short
The broader family of metrics (including but not limited to the 'Core' ones) that Google and the web performance community use to measure real user experience.
How to learn this
- 1Install the `web-vitals` JS library and log real metrics from your own app.
- 2Learn the difference between lab data (Lighthouse) and field data (real users).
- 3Compare a few metrics beyond the Core 3, like TTFB and FCP.
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