![]() ![]() Historically, developers have had some, but limited, influence over resource priority using preload and preconnect. Decrease the priority of late-body scripts to allow for better sequencing with images. ![]() Increase the priority of async scripts using better semantics than the current hack that is commonly used (inserting a for the async script).Boost the priority of the LCP image by specifying fetchpriority="high" on the image element, causing LCP to happen sooner.Fetch Priority improving Largest Contentful Paint from 2.6 s to 1.9 s in a test of Google Flights Summary #Ī few key areas where Fetch Priority can help: Fetch Priority can help optimize the Core Web Vitals. In this article, we'll discuss the Fetch Priority API and the fetchpriority HTML attribute, which allow you to hint at the relative priority of a resource ( high or low). Browsers are pretty good at assigning priorities that work well but may not be optimal in all cases. For example, in-viewport images may have a High priority while the priority for early loaded, render-blocking CSS via s in the could be Very High. These priorities can depend on the kind of resource and where it is in the document. When a browser parses a web page and begins to discover and download resources such as images, scripts, or CSS, it assigns them a fetch priority in an attempt to download resources in an optimal order. This feature was originally called Priority Hints but was renamed to Fetch Priority after standardization. ![]()
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