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May 2025 Release Notes

· 2 min read

More alerting options, improved design, and new Lighthouse insights audits.

Customize RUM alerts

You can now set custom alert thresholds for real user monitoring data.

RUM alerts config UI

Design updates

We've tidied up our application to make it easier to find the most important information. In particular, the Web Vitals tab has a new structure separating the overall Core Web Vitals assessment from metric-specific debug data.

Core Web Vitals assessment data

Lighthouse upgrade

We've upgraded Lighthouse to version 12.6.0, which includes the Lighthouse performance insights audits!

Lighthouse insights audits

New free tool: view HAR file request waterfalls

HTTP Archive files record what resources a browser loads when loading a website. Our new free HAR file analyzer lets you visualize HAR files using the DebugBear request waterfall.

HAR File Analyzer

New video: how to improve website performance

We've published a Youtube video explaining how to improve website performance by identifying and fixing common page speed issues.

Video: how to improve website performance

New on the blog:

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