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rossipedia avatar rossipedia commented on April 25, 2024 1

@gaearon <link rel="modulepreload" /> tags are being moved to before <link rel="stylesheet" /> tags. Since stylesheets are blocking, if you have a decent amount of modulepreloads then you end up delaying the initial render by however long it takes the browser to free up a network connection to fetch the stylesheet due to all the in-flight preloads.

I think modulepreloads should ideally be moved to after the last stylesheet link tag, which would let the browser fetch the blocking CSS as fast as possible before attempting to preload any JS modules, which can occur asynchronously and won't block the initial paint.

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jrestall avatar jrestall commented on April 25, 2024 1

Ideally React fixes this by automatically prioritizing stylesheets over modulepreloads and a workaround isn't needed.

However to move the stylesheets above the modulepreloads in the meantime, you can add a precedence: 'high' attribute on stylesheet links from the Remix links function. I don't think this is documented but I learnt it from the React unit tests.

e.g.

  export const links: LinksFunction = () => [
    { rel: 'stylesheet', href: appStylesHref, precedence: 'high' },
  ];

Will result in the stylesheet link being placed at the top of the head element, above the modulepreloads.

  <head>
      <meta charSet="utf-8"/>
      <meta name="viewport" content="width=device-width,initial-scale=1"/>
      <link rel="stylesheet" href="/build/_assets/app-B5PUCUEH.css" data-precedence="high"/>
      <title>New Remix App</title>
      <meta name="description" content="Welcome to Remix!"/>
      <link rel="modulepreload" href="/build/entry.client-4MXBZIKC.js"/>
      <link rel="modulepreload" href="/build/_shared/chunk-PNG5AS42.js"/>
      <link rel="modulepreload" href="/build/root-XKG6C447.js"/>
      <link rel="modulepreload" href="/build/routes/_index-T377ZUPD.js"/>
  </head>

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lili21 avatar lili21 commented on April 25, 2024

the link order is important cause we want to preload some critical image to decrease the LCP time

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lili21 avatar lili21 commented on April 25, 2024

downgrade the version to 18.2.0, and the order is expected.

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SamarthBagga avatar SamarthBagga commented on April 25, 2024

Hi @lili21 , i am new to open source could i get a chance to work on this issue?

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gaearon avatar gaearon commented on April 25, 2024

When you say "messed up" do you mean some tags or missing? Or can you be more specific?

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lili21 avatar lili21 commented on April 25, 2024

the order of links is not expected.

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lili21 avatar lili21 commented on April 25, 2024

those <link rel=modulepreload /> tags have been moved into head, which should be in body.

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lili21 avatar lili21 commented on April 25, 2024

it's hurting our performance. you can check the similar problem with vitejs/vite#5120.

after upgrade to react@canary version, we see the same effect in production, the FCP increase about 1s. because all the <link rel=modulepreload /> have been moved into head.

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