why Run Cn41n very slowly?

Hi,please help to me solve how to improve speed ,when user use

CN41N.path:sap menu->Information System -> Structures -> Project Structure

Overview

Now, we input a WBS element and execute F8,but we need long time

So,we have observed program and discover table :M_MEKKE ,Program

distill data from M_MEKKE spending much time.