{"id":834995,"date":"2026-02-23T13:56:58","date_gmt":"2026-02-23T13:56:58","guid":{"rendered":"https:\/\/www.knowband.com\/blog\/?p=834995\/"},"modified":"2026-02-23T13:57:20","modified_gmt":"2026-02-23T13:57:20","slug":"implementing-lazy-loading-for-product-images-in-opencart","status":"publish","type":"post","link":"https:\/\/www.knowband.com\/blog\/opencart-blog\/implementing-lazy-loading-for-product-images-in-opencart\/","title":{"rendered":"Implementing Lazy Loading for Product Images in OpenCart"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">In today\u2019s internet-driven world, users expect websites to load instantly. Customers want pages to load quickly when they visit your <a href=\"http:\/\/opencart.com\/\">OpenCart<\/a> website. Customers may become irritated, and your business may lose revenue if your product pages take too long to load, especially on mobile devices where internet rates may be slower.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Large or numerous graphics are frequently the primary cause of slow page loading. Product photos might be big files, but they are an essential component of any e-commerce website. Lazy loading can help with it.<\/span><\/p>\n<h2><b>The Performance Challenge in eCommerce Sites<\/b> <a href=\"https:\/\/www.knowband.com\/blog\/wp-content\/uploads\/2026\/02\/image-3.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-835005\" src=\"https:\/\/www.knowband.com\/blog\/wp-content\/uploads\/2026\/02\/image-3.png\" alt=\"\" width=\"1000\" height=\"504\" srcset=\"https:\/\/www.knowband.com\/blog\/wp-content\/uploads\/2026\/02\/image-3.png 1000w, https:\/\/www.knowband.com\/blog\/wp-content\/uploads\/2026\/02\/image-3-300x151.png 300w, https:\/\/www.knowband.com\/blog\/wp-content\/uploads\/2026\/02\/image-3-768x387.png 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/a><\/h2>\n<p><span style=\"font-weight: 400;\">Moment\u2019s eCommerce spots are veritably visual. A standard order runner can have<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">20-50 pictures of the product<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Banners<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Thumbnails and icons<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Sections on related products<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The browser will need to load each image before the page is completely interactive if all of these are loaded at once. This leads to:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">First Contentful Paint (FCP) at a slower pace<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Increased Interactive Time\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Poor performance on mobile devices<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A higher server load<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Increased rates of bounce<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The user experience will be significantly impacted by this, particularly on slower networks.<\/span><\/p>\n<h2><b>What Is Lazy Loading?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The technique known as &#8220;lazy loading&#8221; delays the loading of images (or other content) until they are truly required, which is typically when a user is ready to view them by scrolling into view. Lazy loading waits until the user is ready to view the image before loading it, as opposed to loading all the images at once.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Lazy loading has the following advantages:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Bandwidth conservation<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Better performance on mobile devices<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Improved SEO and essential web elements<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Quick loading of the first page<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">When many of the images may load simultaneously on product pages, lazy loading is especially helpful.<\/span><\/p>\n<h2><b>Why Lazy Loading Matters<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Imagine looking through an item catalogue. Even if the product images are far below the fold, your browser will try to load them all at once when using traditional loading. <\/span><span style=\"font-weight: 400;\">Only the images that are in or near the viewable portion of the screen will load initially when using lazy loading. The remaining images will gradually load as the viewer scrolls.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Both your clients and search engines like Google, which like websites that load quickly, will benefit from a quicker and more seamless experience.<\/span><\/p>\n<h3><b>Real-World Example: Category Page Without Lazy Loading<\/b><\/h3>\n<p><b>Consider this example<\/b><span style=\"font-weight: 400;\">:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">24 products on a category page, <\/span><span style=\"font-weight: 400;\">Each thumbnail = 150 KB, <\/span><span style=\"font-weight: 400;\">Total image weight = 3.6 MB<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Before even loading banners, CSS, and JavaScript, the browser has to download close to 4 MB of images.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Now consider that the visitor only scrolled halfway through the page. Half the images were never viewed \u2013 but downloaded anyway. Therefore, t<\/span><span style=\"font-weight: 400;\">his is wasted bandwidth and 0<\/span><span style=\"font-weight: 400;\">This is where lazy loading comes in.<\/span><\/p>\n<h3><b>Lazy Loading and Core Web Vitals<\/b><\/h3>\n<p><b>Web Vitals. <\/b><span style=\"font-weight: 400;\">The following are directly impacted by large images:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Paint with the Largest Content (LCP)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Shift in Cumulative Layout (CLS)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Next Paint Interaction (INP)<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Correctly loading images slowly will enhance performance metrics, particularly on product and category listing pages.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Still, there&#8217;s one important thing to keep in mind<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u00a0Images above the pack, like the primary product image on a product detail runner, should n&#8217;t be lazy loaded.<\/span><\/p>\n<h3><b>When to Apply Lazy Loading?<\/b><\/h3>\n<p><b>Lazy loading is best suited for:<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Product listing pages<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Category pages<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Blog listing pages<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Manufacturer pages<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Upsell sections<\/span><\/li>\n<\/ul>\n<p><b>It might not be the best fit for:<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Hero banners above the fold<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Main product image on the product page<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Critical branding visuals<\/span><\/li>\n<\/ul>\n<h2><b>How to Implement Lazy Loading in OpenCart<\/b><\/h2>\n<h4><b>Method 1: Lazy loading in native browsers<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">Modern browsers use the loading=&#8221;lazy&#8221; property to provide built-in lazy loading<\/span><\/p>\n<p><b>Example:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">&lt;img src=&#8221;image.jpg&#8221;<\/span><b> loading=&#8221;lazy&#8221;<\/b><span style=\"font-weight: 400;\"> alt=&#8221;Product Image&#8221;&gt;<\/span><\/p>\n<p><b>OpenCart Steps:<\/b><b><\/b><\/p>\n<ul>\n<li aria-level=\"1\"><span style=\"font-weight: 400;\">Open your theme file:<\/span><\/li>\n<\/ul>\n<table class=\"table table-hover\">\n<thead>\n<tr>\n<th><b>Version<\/b><\/th>\n<th><b>File Path<\/b><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><b>OpenCart 2.x<\/b><\/td>\n<td><b>catalog\/view\/theme\/your_theme\/template\/product\/category.tpl<\/b><\/td>\n<\/tr>\n<tr>\n<td><b>OpenCart 3.x<\/b><\/td>\n<td><b>catalog\/view\/theme\/your_theme\/template\/product\/category.twig<\/b><\/td>\n<\/tr>\n<tr>\n<td><b>OpenCart 4.x<\/b><\/td>\n<td><b>catalog\/view\/template\/product\/category.twig<\/b><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li><span style=\"font-weight: 400;\">Locate the product image <\/span><span style=\"font-weight: 400;\">&lt;img&gt;<\/span><span style=\"font-weight: 400;\"> tag.<\/span><\/li>\n<li><span style=\"font-weight: 400;\">Change it as follows:<\/span><\/li>\n<\/ul>\n<p><strong>Before:<\/strong><\/p>\n<pre><span style=\"font-weight: 400;\">&lt;img src=\"{{ product.thumb }} alt=\"{{ product.name }}\"\u00a0 width=\"300\"\u00a0 height=\"300\"<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0title=\"{{ product.name }}\"&gt;<\/span>\r\n\r\n<strong>After:<\/strong><\/pre>\n<pre><span style=\"font-weight: 400;\">&lt;img src=\"{{ product.thumb }}\"<\/span><b>loading=\"lazy\"<\/b><span style=\"font-weight: 400;\">\u00a0 alt=\"{{ product.name }}\"\u00a0 width=\"300\"\u00a0 height=\"300\"<\/span><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0title=\"{{ product.name }}\"&gt;<\/span><\/pre>\n<p><span style=\"font-weight: 400;\">That&#8217;s all. JavaScript is not necessary. Furthermore, this is the most easy and cleanest way.<\/span><\/p>\n<h4><b>Method 2: Using lazysizes (Best for Older Browser Support)<\/b><\/h4>\n<p><b>Steps:<\/b><\/p>\n<ol>\n<li><span style=\"font-weight: 400;\"> Add the lazysizes script:<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">&lt;script src=\"https:\/\/cdnjs.cloudflare.com\/ajax\/libs\/lazysizes\/5.3.2\/lazysizes.min.js\" async&gt;<\/span><span style=\"font-weight: 400;\">&lt;\/script&gt;<\/span><\/pre>\n<\/li>\n<li><span style=\"font-weight: 400;\"> Open your theme file based on the OpenCart version mentioned in Method 1 and update the image markup:<\/span><\/li>\n<\/ol>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Before:<\/span><b><br \/>\n<\/b><\/p>\n<pre><span style=\"font-weight: 400;\">&lt;img src=\"{{ product.thumb }}\" class=\"lazyload\" width=\"300\" height=\"300\" alt=\"{{ product.name }}\"&gt;<\/span><\/pre>\n<\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">After:<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">&lt;img data-src=\"{{ product.thumb }}\" class=\"lazyload\" width=\"300\" height=\"300\" alt=\"{{ product.name }}\"&gt;<\/span><\/pre>\n<\/li>\n<\/ul>\n<p><b>Method 3: Using Intersection Observer API (Advanced Control)<\/b><\/p>\n<p><a href=\"https:\/\/www.knowband.com\/blog\/wp-content\/uploads\/2026\/02\/image-4.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-835004\" src=\"https:\/\/www.knowband.com\/blog\/wp-content\/uploads\/2026\/02\/image-4.png\" alt=\"\" width=\"1427\" height=\"460\" srcset=\"https:\/\/www.knowband.com\/blog\/wp-content\/uploads\/2026\/02\/image-4.png 1427w, https:\/\/www.knowband.com\/blog\/wp-content\/uploads\/2026\/02\/image-4-300x97.png 300w, https:\/\/www.knowband.com\/blog\/wp-content\/uploads\/2026\/02\/image-4-1024x330.png 1024w, https:\/\/www.knowband.com\/blog\/wp-content\/uploads\/2026\/02\/image-4-768x248.png 768w\" sizes=\"auto, (max-width: 1427px) 100vw, 1427px\" \/><\/a><\/p>\n<p><span style=\"font-weight: 400;\">Modern JavaScript API for better control.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Example:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">const images = document.querySelectorAll(&#8220;img[data-src]&#8221;);<\/span><\/p>\n<p><span style=\"font-weight: 400;\">const observer = new IntersectionObserver((entries, observer) =&gt; {<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u00a0\u00a0entries.forEach(entry =&gt; {<\/span><\/p>\n<p><span style=\"font-weight: 400;\">if (entry.isIntersecting) {<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u00a0\u00a0<\/span> <span style=\"font-weight: 400;\">const img = entry.target;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u00a0\u00a0<\/span> <span style=\"font-weight: 400;\">img.src = img.dataset.src;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0observer.unobserve(img);<\/span><\/p>\n<p><span style=\"font-weight: 400;\">}<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u00a0\u00a0});<\/span><\/p>\n<p><span style=\"font-weight: 400;\">});<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">images.forEach(img =&gt; observer.observe(img));<\/span><\/p>\n<p>This method gives full control over loading behaviour.<\/p>\n<h4><b>Important: AJAX-Based Product Filtering<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">When products are loaded dynamically via AJAX:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Native <\/span><span style=\"font-weight: 400;\">loading=&#8221;lazy&#8221;<\/span><span style=\"font-weight: 400;\"> works automatically.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">However, ifyou are using <\/span><span style=\"font-weight: 400;\">lazysizes, <\/span><span style=\"font-weight: 400;\">Intersection Observer then <\/span><span style=\"font-weight: 400;\">You must re-trigger lazy loading after AJAX content loads.<\/span><\/p>\n<p><b>Example:<\/b><\/p>\n<pre><span style=\"font-weight: 400;\">document.addEventListener('ajaxComplete', function() {<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0lazySizes.autoSizer.checkElems();<\/span>\r\n\r\n<span style=\"font-weight: 400;\">});<\/span>\r\n\r\n<span style=\"font-weight: 400;\">Otherwise, newly injected images may not load correctly.<\/span><\/pre>\n<h3><b>The Best Methods for Lazy Loading in OpenCart<\/b><\/h3>\n<p><b>\u2714 <\/b><span style=\"font-weight: 400;\">Avoid loading the images above the fold.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u2714 Make sure your images are the right size; avoid using thumbnails that are too big.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u2714 Always use PageSpeed Insights to test; optimiseoptimize images to WebP format.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u2714 Always test with PageSpeed Insights<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u2714 After making changes to the template, clear the OpenCart cache.<\/span><\/p>\n<h3 data-start=\"54\" data-end=\"110\">Measuring Performance Before and After Implementation<\/h3>\n<p data-start=\"112\" data-end=\"171\">To evaluate the impact of lazy loading, follow these steps:<\/p>\n<h3 data-start=\"173\" data-end=\"200\">Before Implementation<\/h3>\n<p data-start=\"201\" data-end=\"260\">Test your category page and record the following metrics:<\/p>\n<ul>\n<li data-start=\"263\" data-end=\"274\">Page size<\/li>\n<li data-start=\"263\" data-end=\"274\">Page load time<\/li>\n<li data-start=\"296\" data-end=\"320\">Core Web Vitals scores<\/li>\n<\/ul>\n<h3 data-start=\"322\" data-end=\"348\">After Implementation<\/h3>\n<p data-start=\"349\" data-end=\"420\">Run the same tests again and compare the results. You should observe:<\/p>\n<ul>\n<li data-start=\"423\" data-end=\"450\">Reduced initial load time<\/li>\n<li data-start=\"453\" data-end=\"486\">Lower Total Blocking Time (TBT)<\/li>\n<li data-start=\"489\" data-end=\"528\">Improved Lighthouse performance score<\/li>\n<\/ul>\n<p>The implementation options outlined in this guide, from native HTML attributes to lazysizes and the Intersection Observer API, offer solutions for every level of technical complexity. Whether you are maintaining a small boutique store or managing a high-traffic multi-category catalogue, there is an approach that fits your needs. Start with Method 1 for instant results, and build up to more advanced methods as your requirements grow.<\/p>\n<p>Performance optimisation is not a one-time task as it is an ongoing commitment. Pair lazy loading with image compression, WebP conversion, and proper caching to unlock the full potential of your OpenCart store\u2019s speed.<\/p>\n<h2>About Knowband<\/h2>\n<p>Knowband is a trusted eCommerce plugin and extension provider with years of experience helping online merchants build faster, smarter, and more feature-rich stores. Whether you run your store on <strong><a href=\"https:\/\/www.prestashopmobileapp.com\/\">PrestaShop<\/a>, <a href=\"https:\/\/www.opencartmobileshop.com\/\">OpenCart<\/a>, Shopify, WooCommerce, Magento<\/strong>, or any other major platform, Knowband offers a wide range of ready-to-use plugins and extensions that help you enhance functionality, improve performance, and deliver a better shopping experience, without needing to build from scratch.<\/p>\n<p>Beyond plugins, Knowband also offers comprehensive <a href=\"http:\/\/www.velsof.com\"><strong>website development and mobile app development<\/strong><\/a> services. Whether you need a fully custom eCommerce storefront built from the ground up, a tailored mobile shopping app for iOS and Android, or a bespoke integration with your existing systems, Knowband\u2019s team of developers has the expertise to bring your vision to life.<\/p>\n<p>If you are looking to optimize further your OpenCart store, or any other eCommerce platform, explore Knowband\u2019s plugin marketplace or get in touch with our team to discuss a custom solution tailored to your business goals.<\/p>\n<p>Contact us at <strong>support@knowband.com<\/strong> for custom plugin development, website development, and mobile app development services.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In today\u2019s internet-driven world, users expect websites to load instantly. Customers want pages to load quickly when they visit your OpenCart website. Customers may become irritated, and your business may lose revenue if your product pages take too long to load, especially on mobile devices where internet rates may be slower. Large or numerous graphics [&hellip;]<\/p>\n","protected":false},"author":41,"featured_media":835003,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kbui_enabled":"","footnotes":""},"categories":[4,2,7,1111],"tags":[47494,47490,17307,47487,47495,109,47492,47489,47488,47493,47491],"class_list":["post-834995","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ecommerce-blog","category-opencart-blog","category-opencart-tutorials","category-tips","tag-ecommerce-image-lazy-loading","tag-improve-opencart-speed","tag-knowband","tag-lazy-loading-opencart","tag-loadinglazy-opencart","tag-opencart","tag-opencart-core-web-vitals","tag-opencart-image-optimization","tag-opencart-lazy-loading-tutorial","tag-opencart-page-speed-optimization","tag-opencart-performance-optimization"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - 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enhance user experience, and boost SEO performance with easy step-by-step guidance.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.knowband.com\/blog\/opencart-blog\/implementing-lazy-loading-for-product-images-in-opencart\/\" \/>\n<meta property=\"og:site_name\" content=\"Knowband Blog | Ecommerce Modules\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/Knowband\" \/>\n<meta property=\"article:published_time\" content=\"2026-02-23T13:56:58+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-02-23T13:57:20+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.knowband.com\/blog\/wp-content\/uploads\/2026\/02\/Implementing-Lazy-Loading-for-Product-Images-in-OpenCart.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"760\" \/>\n\t<meta property=\"og:image:height\" content=\"300\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Olivia Smith\" \/>\n<meta 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