Desktop and mobile
Toggle the device before running the test to measure with Lighthouse's desktop or mobile profile. The throttling and viewport differ, and mobile scores are usually lower, so test the one that matches your audience.
See what's slowing the page down
The report also lists the biggest performance opportunities, such as render-blocking resources, oversized images and inefficient caching, each with an explanation of what to fix.
Frequently asked
- Is this lab or field data?
- Lab data. PageGauge uses the Lighthouse run from Google PageSpeed Insights, not real-user (CrUX) field data. INP needs real user interactions, so a lab test reports TBT instead. Use these numbers for debugging and before/after comparisons.
- What's a good LCP?
- Google considers LCP under 2.5s 'good', 2.5–4s 'needs improvement', and over 4s 'poor'.