Powercli retrieving information slowly

Hi,

Recently we have upgraded one of our VC to VSphere 5.1, though the esx hosts are still in version 4.1 and planning to upgrade to 5.1.

Now when I am running a powercli script which used to retrieve information much faster in VSphere 4.1 taking too much time vSphere 5.1. Im using powercli version 5.0.1 build 581491.

Any suggestion.