Add lazy loading to images in examples page

examples/index.html

@@ -169,7 +169,7 @@
 				'<div class="card">',
 				'	<a href="' + file + '.html" target="viewer">',
 				'		<div class="cover">',
-				'			<img src="screenshots/' + file + '.png" />',
+				'			<img src="screenshots/' + file + '.png" loading="lazy" />',
 				'		</div>',
 				'		<div class="title">' + getName( file ) + '</div>',
 				'	</a>',