@bugsnag/browser-performance

Performance monitoring for browsers

Monitor the page load speed, capture WebVitals and take other measurements in your web app and see the results in your BugSnag dashboard.

Features

• Reporting of page loads with WebVital metrics
• Automatic measurement of fetch and XHR request times
• Start and end your own spans to record custom parts of your code

Getting started

This functionality is currently in its preview phase – please contact us for more information.

For integration instructions, see our online docs: docs.bugsnag.com/performance/browser-js

Pre-releases

We are currently publishing pre-1.0 releases. These releases may contain breaking changes, which are documented in the CHANGELOG.md.

Support

• Read the integration guide
• Search open and closed issues for similar problems
• Report a bug or request a feature

License

The BugSnag JavaScript Performance SDK is free software released under the MIT License. See the LICENSE for details.

Changelog

[v3.0.0] (2025-08-13)

Breaking change: For React Native apps integrating with the native Android/iOS Performance SDKs, the minimum required versions are now:

• Bugsnag Android Performance v2.0.0
• Bugsnag Cocoa Performance v1.14.0

Upgrading these versions is required for continued compatibility with the React Native integration. Please refer to the linked release notes for details on changes in the native SDKs.

Added

• (react-native) Added BugsnagJavascriptSpansPlugin to @bugsnag/plugin-react-native-span-access to support accessing JavaScript span controls from native code #682