2023
2 featuresThe decodedBodySize, encodedBodySize, and transferSize properties of the PerformanceResourceTiming API reports the size of resources loaded.
The serverTiming property of the PerformanceResourceTiming API contains server timing information about network requests.
2021
2 featuresThe paint performance entry and the PerformancePaintTiming API measures the duration of "paint" (also called "render") operations as a page loads. The API measures the time to First Paint (FP) and First Contentful Paint (FCP), common metrics for perceived loading times.
2017
1 featuresPerformanceResourceTiming entries report when network events happen while loading a resource, such as when connections start and end. You can use this information to measure loading times.
2015
1 featuresThe performance global object and the PerformanceObserver API provide access to performance-related information for the current execution context.