Cache isModuleOutputEnabled or isModuleEnabled status

app/code/core/Mage/Adminhtml/Block/System/Config/Form/Fieldset/Modules/DisableOutput.php

@@ -101,6 +101,8 @@ protected function _getFieldHtml($fieldset, $moduleName)
                 'inherit'       => $inherit,
                 'can_use_default_value' => $this->getForm()->canUseDefaultValue($e),
                 'can_use_website_value' => $this->getForm()->canUseWebsiteValue($e),
+                'scope'         => true,
+                'scope_label'   => Mage::helper('adminhtml')->__('[STORE VIEW]'),
             ]
         )->setRenderer($this->_getFieldRenderer());
 

app/code/core/Mage/Core/Helper/Abstract.php

@@ -42,6 +42,8 @@ abstract class Mage_Core_Helper_Abstract
      */
     protected $_layout;
 
+    protected array $modulesDisabled = [];
+
     /**
      * Retrieve request object
      *
@@ -150,15 +152,19 @@ public function isModuleEnabled($moduleName = null)
             $moduleName = $this->_getModuleName();
         }
 
+        if (array_key_exists($moduleName, $this->modulesDisabled)) {
+            return $this->modulesDisabled[$moduleName];
+        }
+
         if (!Mage::getConfig()->getNode('modules/' . $moduleName)) {
-            return false;
+            return $this->modulesDisabled[$moduleName] = false;
         }
 
         $isActive = Mage::getConfig()->getNode('modules/' . $moduleName . '/active');
         if (!$isActive || !in_array((string)$isActive, ['true', '1'])) {
-            return false;
+            return $this->modulesDisabled[$moduleName] = false;
         }
-        return true;
+        return $this->modulesDisabled[$moduleName] = true;
     }
 
     /**