---
title: "LCP image has no fetchpriority=\"high\" (perf/lcp-image-no-priority)"
description: "perf/lcp-image-no-priority: Images start at low priority until layout proves they are in the viewport."
canonical: https://void-design.vercel.app/rules/perf/lcp-image-no-priority
lastModified: 2026-09-16
---

# LCP image has no fetchpriority="high"

`perf/lcp-image-no-priority` · severity **warn** · category Performance · detected by `void perf` and `void audit`

## Why it matters

Images start at low priority until layout proves they are in the viewport. fetchpriority="high" lets the LCP image download immediately, often saving 0.5-1 s.

## How to fix it

Add fetchpriority="high" to the LCP <img> (Next 16: fetchPriority="high" or preload on <Image>). Use it on at most one image per page.

## Example

```
<img src="/hero.avif" fetchpriority="high" alt="…">
```

## References

- https://web.dev/articles/fetch-priority

## More performance rules

`void perf` reports 25 rules in this category. Core Web Vitals and bytes: LCP, CLS, TBT, TTFB, JavaScript, CSS, fonts, images, caching and compression, measured as the median of several runs on a throttled mobile and a desktop profile.

- `too-many-fonts` Too many font files are downloaded — [perf/too-many-fonts](https://void-design.vercel.app/rules/perf/too-many-fonts)
- `image-budget` Image transfer exceeds the budget — [perf/image-budget](https://void-design.vercel.app/rules/perf/image-budget)
- `too-many-requests` Page makes many requests — [perf/too-many-requests](https://void-design.vercel.app/rules/perf/too-many-requests)
- `lcp-image-lazy` LCP image is lazy-loaded — [perf/lcp-image-lazy](https://void-design.vercel.app/rules/perf/lcp-image-lazy)
- `lcp-background-image` LCP element is a CSS background image — [perf/lcp-background-image](https://void-design.vercel.app/rules/perf/lcp-background-image)
- `image-oversized` Image is much larger than its rendered size — [perf/image-oversized](https://void-design.vercel.app/rules/perf/image-oversized)
- `image-legacy-format` Image served in a legacy format — [perf/image-legacy-format](https://void-design.vercel.app/rules/perf/image-legacy-format)
- `images-missing-dimensions` Images without width/height or aspect-ratio — [perf/images-missing-dimensions](https://void-design.vercel.app/rules/perf/images-missing-dimensions)

Detected by `void perf` and `void audit`. Explain it in a terminal: `void rules perf/lcp-image-no-priority`