Improve domReady performance for faster load times

Based on magento/magento2#23313

composer.json

@@ -156,6 +156,11 @@
                     "description": "Fixes collapsible issue with scrollin to the content even if it is visible",
                     "filename": "essential/m233-collapsible-scrolling-fix.patch",
                     "version-constraint": "2.3.3"
+                },
+                {
+                    "description": "Improve domReady performance for faster load times",
+                    "filename": "essential/m23-improve-domready-performance.patch",
+                    "version-constraint": ">=2.3.2,<2.3.5"
                 }
             ],
             "magento/module-search": [

essential/m23-improve-domready-performance.patch

@@ -0,0 +1,32 @@
+diff --git a/lib/web/requirejs/domReady.js b/lib/web/requirejs/domReady.js
+index 31bd0d7..099c6f7 100644
+--- a/lib/web/requirejs/domReady.js
++++ b/lib/web/requirejs/domReady.js
+@@ -78,7 +78,7 @@ define(function () {
+             }
+         }
+
+-        //Check if document already complete, and if so, just trigger page load
++        //Check if document is no longer loading, and if so, just trigger page load
+         //listeners. Latest webkit browsers also use "interactive", and
+         //will fire the onDOMContentLoaded before "interactive" but not after
+         //entering "interactive" or "complete". More details:
+@@ -89,8 +89,9 @@ define(function () {
+         //so removing the || document.readyState === "interactive" test.
+         //There is still a window.onload binding that should get fired if
+         //DOMContentLoaded is missed.
+-        if (document.readyState === "complete") {
+-            pageLoaded();
++        if (document.readyState !== "loading") {
++            // Handle it asynchronously to allow scripts the opportunity to delay ready
++            setTimeout(pageLoaded);
+         }
+     }
+
+@@ -126,4 +127,4 @@ define(function () {
+     /** END OF PUBLIC API **/
+
+     return domReady;
+-});
+\ No newline at end of file
++});