MC-20225: Low performance in getting configurable product attribute options functionality

- Fix performance issue related to AbstractAttribute::getOptions due to the expansive cost of the function AbstractAttribute::convertToObjects
- Fix performance issue related to loading options multiple times

Author: bubasuma

app/code/Magento/Catalog/Ui/DataProvider/Product/Form/Modifier/Eav.php

@@ -46,6 +46,7 @@
  * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
  * @SuppressWarnings(PHPMD.TooManyFields)
  * @SuppressWarnings(PHPMD.ExcessiveClassComplexity)
+ * @SuppressWarnings(PHPMD.ExcessiveClassLength)
  * @since 101.0.0
  */
 class Eav extends AbstractModifier
@@ -1048,6 +1049,10 @@ private function isScopeGlobal($attribute)
      */
     private function getAttributeModel($attribute)
     {
+        // The statement below solves performance issue related to loading same attribute options on different models
+        if ($attribute instanceof EavAttribute) {
+            return $attribute;
+        }
         $attributeId = $attribute->getAttributeId();
 
         if (!array_key_exists($attributeId, $this->attributesCache)) {

app/code/Magento/ConfigurableProduct/Block/Adminhtml/Product/Edit/Tab/Variations/Config/Matrix.php

@@ -197,6 +197,7 @@ protected function getAttributes()
                 foreach ($attributes as $key => $attribute) {
                     if (isset($configurableData[$key])) {
                         $attributes[$key] = array_replace_recursive($attribute, $configurableData[$key]);
+                        // phpcs:ignore Magento2.Performance.ForeachArrayMerge
                         $attributes[$key]['values'] = array_merge(
                             isset($attribute['values']) ? $attribute['values'] : [],
                             isset($configurableData[$key]['values'])
@@ -412,14 +413,15 @@ private function prepareAttributes(
                 'position' => $configurableAttributes[$attribute->getAttributeId()]['position'],
                 'chosen' => [],
             ];
-            foreach ($attribute->getOptions() as $option) {
-                if (!empty($option->getValue())) {
+            $options = $attribute->usesSource() ? $attribute->getSource()->getAllOptions() : [];
+            foreach ($options as $option) {
+                if (!empty($option['value'])) {
                     $attributes[$attribute->getAttributeId()]['options'][] = [
                         'attribute_code' => $attribute->getAttributeCode(),
                         'attribute_label' => $attribute->getStoreLabel(0),
-                        'id' => $option->getValue(),
-                        'label' => $option->getLabel(),
-                        'value' => $option->getValue(),
+                        'id' => $option['value'],
+                        'label' => $option['label'],
+                        'value' => $option['value'],
                         '__disableTmpl' => true,
                     ];
                 }

app/code/Magento/ConfigurableProduct/Ui/DataProvider/Product/Form/Modifier/Data/AssociatedProducts.php

@@ -21,6 +21,8 @@
 use Magento\Framework\Escaper;
 
 /**
+ * Associated products helper
+ *
  * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
  */
 class AssociatedProducts
@@ -231,6 +233,8 @@ public function getConfigurableAttributesData()
      *
      * @return void
      * @throws \Zend_Currency_Exception
+     * @SuppressWarnings(PHPMD.CyclomaticComplexity)
+     * phpcs:disable Generic.Metrics.NestingLevel
      */
     protected function prepareVariations()
     {
@@ -262,14 +266,15 @@ protected function prepareVariations()
                                 'position' => $configurableAttributes[$attribute->getAttributeId()]['position'],
                                 'chosen' => [],
                             ];
-                            foreach ($attribute->getOptions() as $option) {
-                                if (!empty($option->getValue())) {
-                                    $attributes[$attribute->getAttributeId()]['options'][$option->getValue()] = [
+                            $options = $attribute->usesSource() ? $attribute->getSource()->getAllOptions() : [];
+                            foreach ($options as $option) {
+                                if (!empty($option['value'])) {
+                                    $attributes[$attribute->getAttributeId()]['options'][$option['value']] = [
                                         'attribute_code' => $attribute->getAttributeCode(),
                                         'attribute_label' => $attribute->getStoreLabel(0),
-                                        'id' => $option->getValue(),
-                                        'label' => $option->getLabel(),
-                                        'value' => $option->getValue(),
+                                        'id' => $option['value'],
+                                        'label' => $option['label'],
+                                        'value' => $option['value'],
                                     ];
                                 }
                             }