Measurement
DCL (DOM Content Loaded)
DOM Content Loaded (DCL) is a browser event that fires when the HTML document has been completely parsed and all deferred scripts have executed, but before stylesheets, images, and subframes have finished loading. It is a key performance metric that affects how quickly users can interact with a page's main content.
DCL timing is measured in Chrome DevTools' Network and Performance panels, and in Lighthouse audits. Google PageSpeed Insights and GTmetrix include DCL as a diagnostic metric. Reducing DCL time involves minimizing render-blocking resources, deferring JavaScript, and simplifying the DOM structure.
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Related Terms
Measurement
FCP (First Contentful Paint)
Refers to the point at which the first pixel renders on a screen after a user navigates to a web page.
Measurement
FID (First Input Delay)
Refers to the metric that represents how quickly a response is given when an action is requested after the page is loaded.
Measurement
FMP (First Meaningful Paint)
The metric representing the time it takes for a page's primary content to appear on the screen.
Measurement
TTFB (Time to First Byte)
Refers to the time between the browser requesting a page and when it receives the first byte of information from the server.