title: Magento massive product import cache & performance issue
body: <p>I am importing about 10.000 products and updating their data with import custom script on regular basic. I use Magento object to save product data. The problem is that for each product save the process is slower. On 1000 products save it becomes really slow. When I clear cache, everything is ok again. </p>
  
  <p>I have now couple of questions to understand the thing:</p>
  
  <ol>
  <li>Does anybody have any idea why is that?</li>
  <li>Should I disable "Collections Data" cache, or maybe any other type of cache as well?</li>
  <li>Or is there any way to tell Magento not to cache collection data on product save?</li>
  <li>If not, will disabling Collections Data cache slow the page a lot?</li>
  </ol>
  
  <p>Thank you </p>