diff --git a/website/common/templates/common/blocks/image-caption.html b/website/common/templates/common/blocks/image-caption.html
index 001cec3..76414b5 100644
--- a/website/common/templates/common/blocks/image-caption.html
+++ b/website/common/templates/common/blocks/image-caption.html
@@ -2,7 +2,7 @@
 
 <figure>
   <div class="image is-16by9">
-    <img src="{% image_url value.image 'width-1500' %}" alt="{{ value.caption|richtext|extract_text }}" />
+    <img src="{% image_url value.image 'width-1500' %}" alt="{{ value.caption|richtext|extract_text }}" loading="lazy" decoding="async" />
   </div>
   <figcaption>
     {{ value.caption|richtext }}
diff --git a/website/common/templates/common/listing-item.html b/website/common/templates/common/listing-item.html
index 2c05a59..982b7ee 100644
--- a/website/common/templates/common/listing-item.html
+++ b/website/common/templates/common/listing-item.html
@@ -5,7 +5,7 @@
     <figure class="media-left column is-3 image-column">
       {% if page.list_image_url %}
         <a href="{% pageurl page %}" class="image">
-          <img src="{{ page.list_image_url }}">
+          <img src="{{ page.list_image_url }}" loading="lazy" decoding="async" />
         </a>
       {% endif %}
     </figure>
diff --git a/website/common/templates/wagtail_base.html b/website/common/templates/wagtail_base.html
index bf7ef28..2316913 100644
--- a/website/common/templates/wagtail_base.html
+++ b/website/common/templates/wagtail_base.html
@@ -12,7 +12,7 @@
 
 {% block main_content %}
   {% if page.hero_image_url %}
-    <img class="hero" src="{{ page.hero_image_url }}">
+    <img class="hero" src="{{ page.hero_image_url }}" decoding="async" />
   {% endif %}
 
   <section class="hero">
diff --git a/website/contrib/mermaid_block/templates/contrib/blocks/mermaid.html b/website/contrib/mermaid_block/templates/contrib/blocks/mermaid.html
index 9f6707c..4cb3bdf 100644
--- a/website/contrib/mermaid_block/templates/contrib/blocks/mermaid.html
+++ b/website/contrib/mermaid_block/templates/contrib/blocks/mermaid.html
@@ -2,7 +2,7 @@
 
 <figure>
   <div class="image">
-    <img src="https://mermaid.ink/svg/{{ value.pako }}" referrerpolicy="no-referrer" alt="{{ value.caption|richtext|extract_text }}" />
+    <img src="https://mermaid.ink/svg/{{ value.pako }}" referrerpolicy="no-referrer" alt="{{ value.caption|richtext|extract_text }}" loading="lazy" decoding="async" />
   </div>
   <figcaption>
     {{ value.caption|richtext }}
diff --git a/website/contrib/unsplash/templates/unsplash/results.html b/website/contrib/unsplash/templates/unsplash/results.html
index 6216ea4..6a680a4 100644
--- a/website/contrib/unsplash/templates/unsplash/results.html
+++ b/website/contrib/unsplash/templates/unsplash/results.html
@@ -18,7 +18,7 @@
       <tr>
         <td>
           <a class="item-choice" href="{{ row.choose_url }}">
-            <img src="{{ row.item.get_thumbnail_url }}" width="165"/>
+            <img src="{{ row.item.get_thumbnail_url }}" width="165" referrerpolicy="no-referrer" decoding="async" />
           </a>
         </td>
         <td class="title">
diff --git a/website/contrib/unsplash/wagtail_hooks.py b/website/contrib/unsplash/wagtail_hooks.py
index ab49024..ea1b678 100644
--- a/website/contrib/unsplash/wagtail_hooks.py
+++ b/website/contrib/unsplash/wagtail_hooks.py
@@ -72,7 +72,7 @@ class UnsplashPhotoAdmin(ModelAdmin):
 
     def thumbnail(self, instance: UnsplashPhoto) -> str:
         return format_html(
-            "<img src='{}' width=165 class='admin-thumb'/>",
+            "<img src='{}' width=165 class='admin-thumb' loading='lazy' decoding='async' />",
             instance.get_thumbnail_url(),
         )
 
diff --git a/website/contrib/unsplash/widgets.py b/website/contrib/unsplash/widgets.py
index 03fad15..8e5f426 100644
--- a/website/contrib/unsplash/widgets.py
+++ b/website/contrib/unsplash/widgets.py
@@ -13,4 +13,7 @@ class UnsplashPhotoChooser(AdminChooser):
     choose_modal_url_name = "unsplash_photo_chooser:choose"
 
     def get_title(self, instance: UnsplashPhoto) -> str:
-        return format_html("<img src='{}' width=165>", instance.get_thumbnail_url())
+        return format_html(
+            "<img src='{}' width=165 loading='lazy' decoding='async'>",
+            instance.get_thumbnail_url(),
+        )