From a6cb22f73858bcd58030e77b2820b7ca601c3908 Mon Sep 17 00:00:00 2001
From: Jarda Snajdr <jsnajdr@gmail.com>
Date: Wed, 16 Oct 2024 10:36:27 +0200
Subject: [PATCH] Memoize pattern objects returned from getAllowedPatterns

Co-authored-by: jsnajdr <jsnajdr@git.wordpress.org>
Co-authored-by: youknowriad <youknowriad@git.wordpress.org>
Co-authored-by: andrewserong <andrewserong@git.wordpress.org>
Co-authored-by: ndiego <ndiego@git.wordpress.org>
Co-authored-by: colorful-tones <colorful-tones@git.wordpress.org>
Co-authored-by: kevin940726 <kevin940726@git.wordpress.org>
Co-authored-by: ramonjd <ramonopoly@git.wordpress.org>
Co-authored-by: madhusudhand <madhudollu@git.wordpress.org>
Co-authored-by: getdave <get_dave@git.wordpress.org>
Co-authored-by: annezazu <annezazu@git.wordpress.org>
---
 packages/block-editor/src/store/selectors.js | 24 +++++++++++++-------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/packages/block-editor/src/store/selectors.js b/packages/block-editor/src/store/selectors.js
index 1e5dad86eb12ad..c34d96ecf53b85 100644
--- a/packages/block-editor/src/store/selectors.js
+++ b/packages/block-editor/src/store/selectors.js
@@ -2363,6 +2363,21 @@ const getAllowedPatternsDependants = ( select ) => ( state, rootClientId ) => [
 	...getInsertBlockTypeDependants( state, rootClientId ),
 ];
 
+const patternsWithParsedBlocks = new WeakMap();
+function enhancePatternWithParsedBlocks( pattern ) {
+	let enhancedPattern = patternsWithParsedBlocks.get( pattern );
+	if ( ! enhancedPattern ) {
+		enhancedPattern = {
+			...pattern,
+			get blocks() {
+				return getParsedPattern( pattern ).blocks;
+			},
+		};
+		patternsWithParsedBlocks.set( pattern, enhancedPattern );
+	}
+	return enhancedPattern;
+}
+
 /**
  * Returns the list of allowed patterns for inner blocks children.
  *
@@ -2379,14 +2394,7 @@ export const __experimentalGetAllowedPatterns = createRegistrySelector(
 			const { allowedBlockTypes } = getSettings( state );
 			const parsedPatterns = patterns
 				.filter( ( { inserter = true } ) => !! inserter )
-				.map( ( pattern ) => {
-					return {
-						...pattern,
-						get blocks() {
-							return getParsedPattern( pattern ).blocks;
-						},
-					};
-				} );
+				.map( enhancePatternWithParsedBlocks );
 
 			const availableParsedPatterns = parsedPatterns.filter(
 				( pattern ) =>