Not every browser supports the full set of web vitals (see: Web Vitals Browser Support). Until recently, we treated these missing vitals as 0 when calculating Performance Score. This wasn't ideal, your performance may have been great across the metrics collected, but Sentry would show a low overall score due to unsupported vitals.

When calculating the performance score, the score is now based on the subset of vitals supported by a given browser.

As this rolls out you may changes in your Web Vitals Performance Score, with the score increasing for some browsers.

Read more about Web Vitals. If you have any feedback, we'd love to hear it on GitHub or Discord .