diff --git a/config.toml b/config.toml
index 347f002..787989e 100644
--- a/config.toml
+++ b/config.toml
@@ -32,6 +32,7 @@ highlight_themes_css = [
   { theme = "solarized-light", filename = "syntax-theme-light.css" },
 ]
 smart_punctuation = true
+lazy_async_image = true
 bottom_footnotes = true
 
 [search]
diff --git a/content/demo/index.md b/content/demo/index.md
index 1db8a00..4da3576 100644
--- a/content/demo/index.md
+++ b/content/demo/index.md
@@ -338,7 +338,7 @@ The <abbr title="American Standard Code for Information Interchange">ASCII</abbr
 
 <aside>
 Quill and a parchment
-<img class="transparent no-hover" style="margin-bottom: 0; border-radius: 0;" alt="Quill and a parchment" src="https://upload.wikimedia.org/wikipedia/commons/thumb/b/b9/%D7%A7%D7%9C%D7%A3%2C_%D7%A0%D7%95%D7%A6%D7%94_%D7%95%D7%93%D7%99%D7%95.jpg/326px-%D7%A7%D7%9C%D7%A3%2C_%D7%A0%D7%95%D7%A6%D7%94_%D7%95%D7%93%D7%99%D7%95.jpg" />
+<img class="transparent no-hover" style="margin-bottom: 0; border-radius: 0;" alt="Quill and a parchment" decoding="async" loading="lazy" src="https://upload.wikimedia.org/wikipedia/commons/thumb/b/b9/%D7%A7%D7%9C%D7%A3%2C_%D7%A0%D7%95%D7%A6%D7%94_%D7%95%D7%93%D7%99%D7%95.jpg/326px-%D7%A7%D7%9C%D7%A3%2C_%D7%A0%D7%95%D7%A6%D7%94_%D7%95%D7%93%D7%99%D7%95.jpg" />
 </aside>
 
 A quill is a writing tool made from a moulted flight feather (preferably a primary wing-feather) of a large bird. Quills were used for writing with ink before the invention of the dip pen, the metal-nibbed pen, the fountain pen, and, eventually, the ballpoint pen.
diff --git a/content/demo/page.md b/content/demo/page.md
index b0a6a9b..af1f7c5 100644
--- a/content/demo/page.md
+++ b/content/demo/page.md
@@ -4,7 +4,7 @@ title = "Cake Party"
 
 # Welcome to the cake party
 
-<img class="transparent no-hover" style="width:50%" src="https://i1.theportalwiki.net/img/0/0a/Portal_Cake.png"/>
+<img class="transparent no-hover" style="width:50%" decoding="async" loading="lazy" src="https://i1.theportalwiki.net/img/0/0a/Portal_Cake.png"/>
 
 Sadly, the cake is a _lie_
 
diff --git a/templates/404.html b/templates/404.html
index 07d7d5d..fa1edd3 100644
--- a/templates/404.html
+++ b/templates/404.html
@@ -4,7 +4,7 @@
 {%- set rel_attributes = macros_rel_attributes::rel_attributes() | trim -%}
 <picture>
 	<source srcset="{{ get_url(path='404.png') }}" media="(prefers-reduced-motion: reduce)"></source>
-	<img id="not-found" class="pixels transparent no-hover" alt="404" src="{{ get_url(path='404.gif') }}">
+	<img id="not-found" class="pixels transparent no-hover" alt="404" {%- if config.markdown.lazy_async_image -%}decoding="async" loading="lazy"{%- endif -%} src="{{ get_url(path='404.gif') }}">
 </picture>
 
 <h1>Page Not Found</h1>
diff --git a/templates/partials/comments.html b/templates/partials/comments.html
index 0284b50..a321734 100644
--- a/templates/partials/comments.html
+++ b/templates/partials/comments.html
@@ -20,7 +20,7 @@
 
 <section id="comments">
 	{%- if config.extra.comments.show_qr -%}
-		<img id="qrcode" class="no-hover pixels" title="{{ macros_translate::translate(key='comments_qr', default='QR code to a Mastodon post', language_strings=language_strings) }}" src="https://api.qrserver.com/v1/create-qr-code/?data=https://{{ host }}/@{{ username }}/{{ id }}&format=gif" />
+		<img id="qrcode" class="no-hover pixels" title="{{ macros_translate::translate(key='comments_qr', default='QR code to a Mastodon post', language_strings=language_strings) }}" {%- if config.markdown.lazy_async_image -%}decoding="async" loading="lazy"{%- endif -%} src="https://api.qrserver.com/v1/create-qr-code/?data=https://{{ host }}/@{{ username }}/{{ id }}&format=gif" />
 	{%- endif -%}
 	<h2>{{ macros_translate::translate(key="comments", default="Comments", language_strings=language_strings) }}</h2>
 	<p>{{ macros_translate::translate(key="comments_description", default="You can comment on this blog post by publicly replying to this post using a Mastodon or other ActivityPub/Fediverse account. Known non-private replies are displayed below.", language_strings=language_strings) }}</p>