Browser & Web Performance · Senior · Question 24 of 75
Your RUM shows LCP p75 got worse, but Lighthouse scores are unchanged. What's a likely reason?
- 1Lighthouse is broken
- ✓Correct answer: The real user mix changed (devices, countries, cache hit rates) or a regression only affects field conditions
- 3LCP can't be measured in RUM
Explanation
Segment RUM by device class, connection, page type and cache state. A new marketing campaign can shift the mix without code changes.