diff --git src/bp-core/bp-core-filters.php src/bp-core/bp-core-filters.php
index ec84a6990..789145f95 100644
--- src/bp-core/bp-core-filters.php
+++ src/bp-core/bp-core-filters.php
@@ -59,6 +59,9 @@ add_filter( 'bp_email_set_content_html', 'stripslashes', 8 );
 add_filter( 'bp_email_set_content_plaintext', 'wp_strip_all_tags', 6 );
 add_filter( 'bp_email_set_subject', 'sanitize_text_field', 6 );
 
+// Avatars.
+add_filter( 'bp_core_fetch_avatar', 'bp_core_add_loading_lazy_attribute' );
+
 /**
  * Template Compatibility.
  *
@@ -899,6 +902,23 @@ function bp_core_filter_edit_post_link( $edit_link = '', $post_id = 0 ) {
 	return $edit_link;
 }
 
+/**
+ * Add 'loading="lazy"' attribute into images.
+ *
+ * @since 7.0.0
+ *
+ * @string $content Content to inject attribute into.
+ * @return string
+ */
+function bp_core_add_loading_lazy_attribute( $content = '' ) {
+	if ( false === strpos( $content, '<img ' ) ) {
+		return $content;
+	}
+
+	$content = str_replace( '<img ', '<img loading="lazy" ', $content );
+	return $content;
+}
+
 /**
  * Should BuddyPress load the mentions scripts and related assets, including results to prime the
  * mentions suggestions?
diff --git tests/phpunit/testcases/core/avatars.php tests/phpunit/testcases/core/avatars.php
index b56bf73b6..10ce03d6b 100644
--- tests/phpunit/testcases/core/avatars.php
+++ tests/phpunit/testcases/core/avatars.php
@@ -166,7 +166,7 @@ class BP_Tests_Avatars extends BP_UnitTestCase {
 
 		}
 
-		$expected_html = '<img src="' . $avatar_url . '" id="' . $this->params['css_id'] . '" class="' . $this->params['class'] . ' ' . $this->params['object'] . '-' . $this->params['item_id'] . '-avatar avatar-' . $this->params['width'] . ' photo" width="' . $this->params['width'] . '" height="' . $this->params['height'] . '" alt="' . $this->params['alt'] . '" title="' . $this->params['title'] . '" ' . $this->params['extra_attr'] . ' />';
+		$expected_html = '<img loading="lazy" src="' . $avatar_url . '" id="' . $this->params['css_id'] . '" class="' . $this->params['class'] . ' ' . $this->params['object'] . '-' . $this->params['item_id'] . '-avatar avatar-' . $this->params['width'] . ' photo" width="' . $this->params['width'] . '" height="' . $this->params['height'] . '" alt="' . $this->params['alt'] . '" title="' . $this->params['title'] . '" ' . $this->params['extra_attr'] . ' />';
 
 		$this->assertEquals( $html, $expected_html );
 	}