MediaWiki:Common.js

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$(document).ready(function () {
    // Select all images in the content area
    $('#mw-content-text img').each(function () {
        var imgSrc = this.getAttribute('src');

        // Only proceed if the src is valid and doesn't already have a preload
        if (imgSrc && !document.head.querySelector('link[rel="preload"][href="' + imgSrc + '"]')) {
            var link = document.createElement('link');
            link.rel = 'preload';
            link.as = 'image';
            link.href = imgSrc;
            document.head.appendChild(link);
        }
    });
});