Magento how to cache a productCollection

Question

Ive noticed my home page is taking a long time to load - over 6 seconds infact according site24x7.com, so ive been switching elements off to try and determine what is the cause,

Answer 1

If you want to cache $collection, there is already a built-in possibility for collection caching in Magento.

 $_productCollection= Mage::getResourceModel('reports/product_collection');

$cache = Mage::app()->getCache(); //Let's get cache instance
        $cache->setLifetime(86400); //Here we set collection cache lifetime
        $_productCollection->initCache(
            $cache,
            'Bestsellers_', //this is just custom prefix
            array('collections') 
        );
    }

Credit for above code: apiworks.net (http://www.apiworks.net/2015/01/magento-collection-caching.html)

Answer 2

Try

  $storeId = Mage::app()->getStore()->getId(); 
  $cache = Mage::getSingleton('core/cache');
  $key = 'homepage-most-view-' . $storeId;

  if(! $data = $cache->load($key)){
      $_productCollection= Mage::getResourceModel('reports/product_collection')
      ->addAttributeToSelect('*')
      ->addStoreFilter($storeId)
      ->addViewsCount()
      ->addFieldToFilter('visibility', Mage_Catalog_Model_Product_Visibility::VISIBILITY_BOTH)
      ->addFieldToFilter('status',Mage_Catalog_Model_Product_Status::STATUS_ENABLED);
      $_productCollection->getSelect()->limit(8)
      // get the element you need from  $_productCollection and store in $array
      $data = serialize($array);
      $cache->save(urlencode($data), $key, array("homepage_cache"), 60*60*24);
  }
  else{
      $data = unserialize(urldecode($data)); 
 }

See

• http://www.nicksays.co.uk/developers-guide-magento-cache/
• http://inchoo.net/ecommerce/magento/magento-block-caching/