AW Colorswatches performance optimization

AWColorswatches.diff

diff --git a/app/code/local/AW/Colorswatches/Helper/Swatch.php b/app/code/local/AW/Colorswatches/Helper/Swatch.php
index 8a2a868..09807fb 100644
--- a/app/code/local/AW/Colorswatches/Helper/Swatch.php
+++ b/app/code/local/AW/Colorswatches/Helper/Swatch.php
@@ -87,16 +87,22 @@ class AW_Colorswatches_Helper_Swatch
 
         $collection = $swatchAttribute->getSwatchCollection();
         $childProducts = $this->_getAssociatedProductList($product);
+
+        $childCodes = array();
+        foreach ($childProducts as $child) {
+            $childCodes[$child->getId()] = $child->getData($swatchAttribute->getAttributeModel()->getAttributeCode());
+        }
+        $validCodes = array_unique($childCodes);
+
         $result = array();
         foreach($collection as $swatch) {
+            if (!in_array($swatch->getOptionId(), $validCodes)) continue;
+
             /** @var AW_Colorswatches_Model_Swatch $swatch */
-            $image = AW_Colorswatches_Helper_Image::resizeImage($swatch->getImage(), $imgWidth, $imgHeight);
-            $ttImage = AW_Colorswatches_Helper_Image::resizeImage($swatch->getImage(), $tooltipWidth, $tooltipHeight);
             $productList = array();
             $notSaleableList = array();
-            foreach($childProducts as $child) {
-                $value = $child->getData($swatchAttribute->getAttributeModel()->getAttributeCode());
-                if ($value !== $swatch->getOptionId()) {
+            foreach ($childProducts as $child) {
+                if ($childCodes[$child->getId()] !== $swatch->getOptionId()) {
                     continue;
                 }
                 $productList[] = $child->getId();
@@ -108,6 +114,14 @@ class AW_Colorswatches_Helper_Swatch
                     $ttImage = $this->_getProductImage($child, $tooltipWidth, $tooltipHeight);
                 }
             }
+
+            if (!isset($image)) {
+                $image = AW_Colorswatches_Helper_Image::resizeImage($swatch->getImage(), $imgWidth, $imgHeight);
+            }
+            if (!isset($ttImage)) {
+                $ttImage = AW_Colorswatches_Helper_Image::resizeImage($swatch->getImage(), $tooltipWidth, $tooltipHeight);
+            }
+
             $result[$swatch->getOptionId()] = array(
                 'title'        => $swatch->getOptionLabel(),
                 'img'          => $image,
@@ -116,6 +130,8 @@ class AW_Colorswatches_Helper_Swatch
                 'not_saleable' => $notSaleableList,
                 'sort_order'   => $swatch->getSortOrder(),
             );
+
+            unset($image, $ttImage);
         }
         return $result;
     }
@@ -186,4 +202,4 @@ class AW_Colorswatches_Helper_Swatch
     {
         return Mage::helper('catalog/image')->init($product, 'image')->resize($width, $height)->__toString();
     }
-}
\ No newline at end of file
+}