diff --git a/wp-includes/blocks.php b/wp-includes/blocks.php
index d6db591bc6..30219f3ca0 100644
--- a/wp-includes/blocks.php
+++ b/wp-includes/blocks.php
@@ -129,7 +129,11 @@ function register_block_script_handle( $metadata, $field_name, $index = 0 ) {
 	}
 
 	// Path needs to be normalized to work in Windows env.
-	$wpinc_path_norm  = wp_normalize_path( realpath( ABSPATH . WPINC ) );
+	static $wpinc_path_norm = '';
+	if ( ! $wpinc_path_norm ) {
+		$wpinc_path_norm = wp_normalize_path( realpath( ABSPATH . WPINC ) );
+	}
+
 	$theme_path_norm  = wp_normalize_path( get_theme_file_path() );
 	$script_path_norm = wp_normalize_path( realpath( dirname( $metadata['file'] ) . '/' . $script_path ) );
 
@@ -182,7 +186,10 @@ function register_block_style_handle( $metadata, $field_name, $index = 0 ) {
 		return false;
 	}
 
-	$wpinc_path_norm = wp_normalize_path( realpath( ABSPATH . WPINC ) );
+	static $wpinc_path_norm = '';
+	if ( ! $wpinc_path_norm ) {
+		$wpinc_path_norm = wp_normalize_path( realpath( ABSPATH . WPINC ) );
+	}
 
 	$is_core_block = isset( $metadata['file'] ) && 0 === strpos( $metadata['file'], $wpinc_path_norm );
 	// Skip registering individual styles for each core block when a bundled version provided.
diff --git a/wp-includes/version.php b/wp-includes/version.php
index f46a6ffb02..6283f568a7 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.1-beta3-54414';
+$wp_version = '6.1-beta3-54415';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.