description Alertra Overview
AlertZero’s PageSpeed Insights tool analyzes website performance by simulating real browser behavior and measuring key metrics like First Contentful Paint, Largest Contentful Paint, and Cumulative Layout Shift to identify optimization opportunities.
help Alertra FAQ
What does Alertra's PageSpeed Insights analysis measure?
The catalog describes a simulated browser test that reports First Contentful Paint, Largest Contentful Paint, and Cumulative Layout Shift. It also points to the images, scripts, stylesheets, and other resources that can create a loading bottleneck.
Does Alertra test mobile and desktop performance?
A PageSpeed Insights-style audit normally provides separate mobile and desktop lab results, while field data is shown only when enough real-user data exists. Treat a simulated run as a controlled test, not as a guarantee of what every visitor experiences. [Google PageSpeed Insights](https://pagespeed.web.dev/)
What do FCP, LCP, and CLS mean in a report?
FCP measures when the browser first paints visible content, LCP measures when the largest visible element appears, and CLS measures unexpected movement of page elements. A hero image can drive LCP, while an ad or image without reserved dimensions can drive CLS. [Chrome Web Vitals guide](https://developer.chrome.com/docs/crux/guides/pagespeed-insights)
What PageSpeed thresholds should I use when reading Alertra results?
Google's commonly used good thresholds are FCP at 1.8 seconds or less, LCP at 2.5 seconds or less, and CLS at 0.1 or less. Fix the specific resource named in the report rather than treating the overall score as a diagnosis.
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