Ajax load content dynamically and store in browser for speed optimization

//New JS 
function getLocalStorageData(key) {
    var data = localStorage.getItem(key);
    return data ? JSON.parse(data) : null;
}
  function setLocalStorageData(key, data) {
    localStorage.setItem(key, JSON.stringify(data));
}
  var preloadedData = getLocalStorageData('preloadedData') || {};
  function preloadData($element) {
    var objectid = $element.attr('class');
    var objectimg = $element.attr('data-img-url');
      if (!preloadedData[objectid]) {
        jQuery.ajax({
            url: '<?php echo admin_url('admin-ajax.php'); ?>',
            type: 'post',
            data: { 
                action: 'data_fetch_salco', 
                objectid: objectid,
                objectimg: objectimg
            },
            success: function(data) {
                // Store the preloaded data in the object and local storage
                preloadedData[objectid] = data;
                setLocalStorageData('preloadedData', preloadedData);
            },
            error: function() {
                console.log("Error preloading data");
            }
        });
    }
}
  jQuery(document).on('mouseenter', '.popmak', function() {
    preloadData(jQuery(this));
});
 jQuery(document).on('click', '.popmak', function(event) {
    event.preventDefault();
    var $this = jQuery(this);
    var objectid = $this.attr('class');
     var displayContent = function(data) {
        jQuery('.popup__content_dyn').html(data);
        document.querySelectorAll(".wpcf7 > form").forEach(
            function(e) {
                return wpcf7.init(e);
            }
        );
        jQuery(".popup_custom").fadeIn(50).css('display', 'flex');
        jQuery('#Realtor input[value="Realtor"]').attr('checked', 'checked');
    };
     if (preloadedData[objectid]) {
        displayContent(preloadedData[objectid]);
    } else {
        jQuery.ajax({
            url: '<?php echo admin_url('admin-ajax.php'); ?>',
            type: 'post',
            data: { 
                action: 'data_fetch_salco', 
                objectid: objectid,
                objectimg: objectimg
            },
            success: function(data) {
                preloadedData[objectid] = data;
                setLocalStorageData('preloadedData', preloadedData);
                displayContent(data);
            },
            error: function() {
                console.log("Error loading data");
            }
        });
    }
});
 var observer = new IntersectionObserver(function(entries) {
    entries.forEach(function(entry) {
        if (entry.isIntersecting) {
            preloadData(jQuery(entry.target));
        }
    });
}, { threshold: 0.0 }); 
 jQuery('.popmak').each(function() {
    //observer.observe(this);
});
jQuery(document).ready(function() {
    jQuery('.popmak').each(function() {
        preloadData(jQuery(this));
    });
});
//New