CrUX Vis: how Google shows what your users actually feel

2025-11-19

Introduction: why “lab” metrics aren’t everything

“Lighthouse shows 100/100, but users complain about lag” — a familiar pain?

Synthetic tests (Lighthouse, WebPageTest) are great for development.
But the real user is sitting:

• on 3G in the subway,
• with 27 tabs open,
• on an old Android with 2 GB RAM.

These are exactly the scenarios captured by CrUX — the Chrome User Experience Report.
And CrUX Vis is a convenient and free visualizer of that data, launched in 2024.