Performance-Bookmarklet

It runs directly in the browser without external setups, providing instant feedback on page performance using built-in timing APIs like Resource Timing and Navigation Timing.

Offers detailed navigation and resource timing waterfalls, pie charts for domain analysis, and tooltips for precise metrics, making data interpretation straightforward.

Available as a bookmarklet, Chrome extension, and Firefox add-on, ensuring flexibility across different browsers and usage scenarios, as highlighted in the README.

Integrates with custom performance marks and measures, allowing developers to track specific application events alongside standard metrics for enhanced debugging.

Outputs structured data tables to the console for deeper analysis and supports persisting metrics across page refreshes, aiding in continuous performance monitoring.