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fetchpriority-attribute

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Use when optimising Largest Contentful Paint (LCP), reducing render-blocking resource contention, or fine-tuning resource loading order in the critical rendering path.

skills/fetchpriority-attribute/SKILL.md

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# Use fetchpriority to hint resource loading priority

Browsers use internal heuristics to guess resource priority, but they cannot know which image is your LCP candidate. Adding fetchpriority="high" to the LCP image has been shown to reduce LCP by 5–30 % in real-world tests, directly improving Core Web Vitals scores and user-perceived load speed. The attribute costs nothing to add and is the lowest-effort high-impact performance optimisation available today.

## Quick Reference

- Add fetchpriority="high" to the LCP image to accelerate Largest Contentful Paint
- Add fetchpriority="low" to below-the-fold images that would otherwise compete with critical resources
- Use fetchpriority="high" on <link rel="preload"> for critical fonts and CSS
- Avoid marking more than one or two resources as high priority — it defeats the purpose

## Check

Check whether the LCP image or hero element has fetchpriority="high" and whether any high-priority preload links are missing the attribute.
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