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If you like to hyper optimize your site like me, and since it doesn't do any good on mobile (Edit: apparently it works on mobile, ignore this), you can have it selectively grab the script on desktop and save a few bytes like this:

    <script type="text/javascript">
      if (screen.width > 768) {
        let script = document.createElement('script');
        script.src = '//instant.page/1.0.0';
        script.type = 'module';
        script.integrity = 'sha384-6w2SekMzCkuMQ9sEbq0cLviD/yR2HfA/+ekmKiBnFlsoSvb/VmQFSi/umVShadQI';

The site claims it works on mobile

> On mobile, a user starts touching their display before releasing it, leaving on average 90 ms to preload the page.

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