diff --git a/assets/js/src/newsletters/templates/template_box.jsx b/assets/js/src/newsletters/templates/template_box.jsx
index 9bce9857d0..bf802a4d73 100644
--- a/assets/js/src/newsletters/templates/template_box.jsx
+++ b/assets/js/src/newsletters/templates/template_box.jsx
@@ -105,7 +105,7 @@ class TemplateBox extends React.Component {
     if (typeof thumbnail === 'string' && thumbnail.length > 0) {
       preview = (
         <a href="javascript:;" onClick={this.onPreview}>
-          <img src={thumbnail} alt={MailPoet.I18n.t('templatePreview')} />
+          <img src={thumbnail} alt={MailPoet.I18n.t('templatePreview')} loading="lazy" />
           <div className="mailpoet_overlay">
             <p className="mailpoet_more_details">{MailPoet.I18n.t('zoom')}</p>
           </div>