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Sample custom.js:

$(document).ajaxStart(function() {
    var imgs = document.getElementsByTagName('img');
    if (imgs){ 
        for (var i = 0; i < imgs.length; i++) {
            var width = imgs[i].naturalWidth;
            var height = imgs[i].naturalHeight;
            imgs[i].setAttribute('width', width);
            imgs[i].setAttribute('height', height);
        } 
    }
});

You can put this code in the file:
./themes/your-theme/assets/js/custom.js
If such a file "custom.js" does not exist, create it.