diff --git a/lib/init.php b/lib/init.php
index 17c9d39f51ae4..d0af1b334929d 100644
--- a/lib/init.php
+++ b/lib/init.php
@@ -61,7 +61,7 @@ function gutenberg_menu() {
 // disable loading and enqueuing block editor scripts and styles
 add_filter( 'should_load_block_editor_scripts_and_styles', '__return_false', 11 );
 
-add_filter( 'should_load_separate_core_block_assets', '__return_true' );
+// add_filter( 'should_load_separate_core_block_assets', '__return_true' );
 
 // Add `editorScript` to Gutenberg block.json data if it's missing
 function add_core_editor_script( $metadata ) {
diff --git a/packages/blocks/src/api/index.js b/packages/blocks/src/api/index.js
index 28fab17bc5e07..83adf7447fd3d 100644
--- a/packages/blocks/src/api/index.js
+++ b/packages/blocks/src/api/index.js
@@ -121,6 +121,7 @@ export {
 	setGroupingBlockName,
 	getGroupingBlockName,
 	getBlockType,
+	loadBlockType,
 	getBlockTypes,
 	getBlockSupport,
 	hasBlockSupport,
diff --git a/packages/blocks/src/store/selectors.js b/packages/blocks/src/store/selectors.js
index 50b61a7f5710b..7461a3218945f 100644
--- a/packages/blocks/src/store/selectors.js
+++ b/packages/blocks/src/store/selectors.js
@@ -131,11 +131,6 @@ export function getBlockType( state, name ) {
 	return state.blockTypes[ name ];
 }
 
-// export function loadBlockType( state, name ) {
-// 	const blockType = state.blockTypes[ name ];
-// 	return blockType;
-// }
-
 /**
  * Returns block styles by block name.
  *
diff --git a/packages/e2e-tests/specs/performance/post-editor.test.js b/packages/e2e-tests/specs/performance/post-editor.test.js
index 9394d44619890..6d343add57747 100644
--- a/packages/e2e-tests/specs/performance/post-editor.test.js
+++ b/packages/e2e-tests/specs/performance/post-editor.test.js
@@ -37,10 +37,10 @@ import {
 jest.setTimeout( 1000000 );
 
 async function loadHtmlIntoTheBlockEditor( html ) {
-	await page.evaluate( ( _html ) => {
+	await page.evaluate( async ( _html ) => {
 		const { parse } = window.wp.blocks;
 		const { dispatch } = window.wp.data;
-		const blocks = parse( _html );
+		const blocks = await parse( _html );
 
 		blocks.forEach( ( block ) => {
 			if ( block.name === 'core/image' ) {
@@ -54,9 +54,10 @@ async function loadHtmlIntoTheBlockEditor( html ) {
 }
 
 async function load1000Paragraphs() {
-	await page.evaluate( () => {
-		const { createBlock } = window.wp.blocks;
+	await page.evaluate( async () => {
+		const { loadBlockType, createBlock } = window.wp.blocks;
 		const { dispatch } = window.wp.data;
+		await loadBlockType( 'core/paragraph' );
 		const blocks = Array.from( { length: 1000 } ).map( () =>
 			createBlock( 'core/paragraph' )
 		);
diff --git a/packages/e2e-tests/specs/performance/site-editor.test.js b/packages/e2e-tests/specs/performance/site-editor.test.js
index a1a2fa38e73cb..3753a90f31261 100644
--- a/packages/e2e-tests/specs/performance/site-editor.test.js
+++ b/packages/e2e-tests/specs/performance/site-editor.test.js
@@ -62,10 +62,10 @@ describe( 'Site Editor Performance', () => {
 
 		await createNewPost( { postType: 'page' } );
 
-		await page.evaluate( ( _html ) => {
+		await page.evaluate( async ( _html ) => {
 			const { parse } = window.wp.blocks;
 			const { dispatch } = window.wp.data;
-			const blocks = parse( _html );
+			const blocks = await parse( _html );
 
 			blocks.forEach( ( block ) => {
 				if ( block.name === 'core/image' ) {
diff --git a/test/performance/utils.js b/test/performance/utils.js
index e7bbb4206ee8d..c3950d7a7049e 100644
--- a/test/performance/utils.js
+++ b/test/performance/utils.js
@@ -155,10 +155,10 @@ export async function loadBlocksFromHtml( page, filepath ) {
 		throw new Error( `File not found (${ filepath })` );
 	}
 
-	return await page.evaluate( ( html ) => {
+	return await page.evaluate( async ( html ) => {
 		const { parse } = window.wp.blocks;
 		const { dispatch } = window.wp.data;
-		const blocks = parse( html );
+		const blocks = await parse( html );
 
 		blocks.forEach( ( block ) => {
 			if ( block.name === 'core/image' ) {
@@ -172,9 +172,10 @@ export async function loadBlocksFromHtml( page, filepath ) {
 }
 
 export async function load1000Paragraphs( page ) {
-	await page.evaluate( () => {
-		const { createBlock } = window.wp.blocks;
+	await page.evaluate( async () => {
+		const { loadBlockType, createBlock } = window.wp.blocks;
 		const { dispatch } = window.wp.data;
+		await loadBlockType( 'core/paragraph' );
 		const blocks = Array.from( { length: 1000 } ).map( () =>
 			createBlock( 'core/paragraph' )
 		);