Hello Together ,
For this issue , you can use the AL12 and SM50 tcodes.
AL12 Usage ;
Go to tcode AL12 --> Statistics --> Curser Cache --> All Servers
You will see the "Total no of requests for each workprocess" area , if you have "large no of requests" then you should add the WP.
SM50 Usage ;
Go to tcode SM50 --> Check the "CPU Time" if less than 0:20 then you should decrease the WP number.