An Introduction to the Performance API
The Performance API measures the responsiveness of your live web application on real user devices and network connections. It can help identify bottlenecks in your client-side and server-side code with: user timing: Custom measurement of client-side JavaScript function performance paint timing: Browser rendering metrics resource timing: Loading performance of assets and Ajax calls navigation timing: Page loading metrics, including redirects, DNS look-ups, DOM readiness, and more The API addresses several