Bad performance in BPC input form

Hello everyone,

We have BPC 10.1 Version. Generally we face Performance issue in Input form in EPM Excel. When user execute 'refresh' button, it takes 6 min and when click 'save' button, it takes 15 min. When 2nd click 'refresh' button, it will take more time than 1st time click.

Question:

1. is there any way we can figure out why we have such Performance issues?

2. are there any general way we can improve performance?

thanks