Debug Bear

Google has been working on new metrics to measure how ads impact performance. Learn how you can view this data for real visitors and how to check it yourself in Chrome DevTools.

Marketing owns the site experience but developers make the changes. Learn how both teams can use shared performance data, experiments, and alerts to work together on page speed.

Learn what the Server-Timing header is and how to track server-side performance metrics.

Learn how to detect hidden network performance problems before they impact your users. This guide explains Microsoft's new Network Efficiency Guardrails, how they use Document Policy and the Reporting...

Chrome's render-blocking label doesn't always fully illustrate which resources are impacting a page's First Contentful Paint (FCP), Largest Contentful Paint (LCP) or H1-visible metrics. We recently in...

A guide to every audit in Lighthouse's Best Practices category and how to fix failures in order to reach a score of 100.