Paint timingThe 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.performancePerformancewidely2021-04-262023-10-26https://w3c.github.io/paint-timing/https://developer.mozilla.org/docs/Web/API/PerformancePaintTimingapi.PerformancePaintTimingapi.PerformancePaintTiming.first-contentful-paintapi.PerformancePaintTiming.first-paintapi.PerformancePaintTiming.toJSONhttps://nowyoucanuse.com/features--paint-timing.html