Browser & Web Performance · Junior · Question 24 of 75

Why can't Lighthouse report INP in a normal page-load audit?

✓Correct answer: INP requires real user interactions, and a page-load audit doesn't interact with the page
2INP needs a server-side agent
3INP is only available in Firefox

Explanation

Lab tools use Total Blocking Time (TBT) as a proxy: long main-thread tasks during load usually mean poor responsiveness.

Further reading

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