DebugBear

DebugBear is a website performance monitoring and optimization tool that provides continuous tracking of Core Web Vitals, page speed metrics, and detailed performance analysis for web pages.

Meaning & Context

DebugBear specializes in monitoring performance over time with scheduled tests from multiple locations, offering detailed waterfall charts, filmstrip views, and performance budgets. The platform is particularly useful for tracking the performance impact of A/B tests and website changes, providing alerts when metrics degrade. It integrates with CI/CD pipelines and offers comparative analysis to understand performance trends.

Why It Matters

For A/B testing and CRO practitioners, DebugBear helps ensure that optimization experiments don't inadvertently harm page performance and Core Web Vitals scores. The tool can identify when testing platforms or specific variants introduce performance regressions that might suppress conversion rates. Using DebugBear alongside A/B testing platforms enables teams to separate performance-related conversion impacts from the actual design or messaging changes being tested.

Example

A CRO team uses DebugBear to monitor their homepage A/B test and discovers that Variant C, despite showing promising engagement metrics, has increased LCP from 2.1s to 3.8s due to an unoptimized hero image, explaining why the variant's conversion rate remained flat despite higher scroll depth.