What steps can be taken to resolve the link prefetch warning in a Next.js application?

I am currently working on a Next.js application using version 13.4, and I've encountered a warning in the console:

After preloading the resource at <URL>, it was not used within a few seconds of the window's load event. Please ensure that it has an appropriate 'as' value and was intentionally preloaded.

The frequency of this error is on the rise.

Here is a screenshot of the console message: https://i.stack.imgur.com/ZyKYT.png

Answer №1

It appears that you may be preloading CSS files based on the warning image. When using preload, make sure to include the href and as attributes. It seems like the as attribute is missing in your code snippet. Include it like so:

<link rel="preload" href="style.css" as="style" />

For more detailed information, please refer to this document

Answer №2

Dealing with a similar problem, I found that the issue stemmed from google fonts in my case. The solution I discovered was to include 'preload:true' when attempting to access the desired font.

For instance:

export const customFont = OpenSans({
  subsets: ["latin"],
  variable: "--font-custom",
  preload: true,
});

Answer №3

In case you are using Next.js version 13 or above, it might be necessary to include the prefetch={false} attribute in a Link tag. By adding this step, one common issue is resolved. For instance, Link href="/portfolio" prefetch={false}

Answer №4

I encountered a similar issue related to fonts:

The preloaded font with link preload was not being utilized within a short timeframe. It's important to ensure all attributes of the preload tag are configured correctly.

To resolve this, I decided to remove any unused font declarations.

Previously, my code included:

import { Inter, Roboto, Sora } from 'next/font/google

export const inter = Inter({
subsets: ['latin'],
display: 'swap',
variable: '--font-inter'
})

export const roboto = Roboto({
subsets: ['latin'],
display: 'swap',
variable: '--font-roboto',
weight: '500'
})

export const sora = Sora({
subsets: ['latin'],
display: 'swap',
variable: '--font-sora'
})

After making changes (now using only the Inter font in my NextJS project):

import { Inter } from 'next/font/google

export const inter = Inter({
subsets: ['latin'],
display: 'swap',
variable: '--font-inter'
})

This adjustment aligns with the recommendations outlined in the official documentation for utilizing multiple fonts in a NextJS Vercel Project:

https://nextjs.org/docs/app/building-your-application/optimizing/fonts#using-multiple-fonts

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