Pasted

$cache = Mage::app()->getCache();
 
if($cached_product_collection = $cache->load('product-collection-' . $this->getCategoryId()))
    $_productCollection = $cached_product_collection;
else{
    $_productCollection = $this->getLoadedProductCollection();
    $cache->save($_productCollection, 'product-collection-' . $this->getCategoryId(), array('product-collection'), 60*5);
}