EE Page Cache Flushing Performance Enhancement

ee-page-cache-flushing-enhancment.diff

diff --git a/htdocs/app/code/core/Enterprise/PageCache/Model/Observer/Index.php b/htdocs/app/code/core/Enterprise/PageCache/Model/Observer/Index.php
index 57ece57..f0ad2a6 100644
--- a/htdocs/app/code/core/Enterprise/PageCache/Model/Observer/Index.php
+++ b/htdocs/app/code/core/Enterprise/PageCache/Model/Observer/Index.php
@@ -46,6 +46,7 @@ class Enterprise_PageCache_Model_Observer_Index
             $entity->setId($entityId);
             $cacheTags = array_merge($cacheTags, $entity->getCacheIdTags());
         }
+        $cacheTags = array_unique($cacheTags);
         if (!empty($cacheTags)) {
             Enterprise_PageCache_Model_Cache::getCacheInstance()->clean($cacheTags);
         }