average performance drop with application control

Hi, 

My customer is asking what is the average performance drop we can expect when enabling only application control for tcp based applications. Do we have any benchmark or rough estimate that we can safely tell to the customer. We are competing against PANW and they are bragging a lot about their application inspection throughput. I tried looking at the data sheets but there is no TCP based or application based throughput performance nos. 

Any help would be helpful.

Regards

Sebastan