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March 2025 Release Notes

· 2 min read

We've improved our synthetic monitoring data, added new alerting functionality to our RUM product, and published new content to help you make your website fast.

Page weight during the loading process

The new page download progress chart shows you when bandwidth is used while loading the page and how many requests are in progress at any given time.

Page download progress chart

RUM alerts in Slack and Microsoft Teams

RUM alerts are now available in Slack and Teams, in addition to the existing email integration.

Slack alert with RUM data

Lighthouse 12.4 + full-page screenshots

We've upgraded the version of Lighthouse we use to run tests and added a link to let you view the full-page screenshot that's collected by Lighthouse.

Lighthouse full-page screenshot

RUM histogram comparisons

Histograms for real user monitoring dashboards now support comparisons between two date ranges.

RUM histogram comparison

Easier CSS analysis

The CSS size analysis now tells you whether base64 data is embedded in a CSS rule without having to expand it first.

CSS size analysis data with base64 embed

New articles on web performance

Here are some of the new web performance guides we've published this month:

We've also published guides to several page speed tools: WebPageTest, Pingdom, and PageSpeed Insights.

New Youtube videos

We've got some new videos on our Youtube channel explaining how to speed up your website:

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