Hi ,
From the screenshot dont think that you have any sort of memory issues due to the parameter setting
of the memory .
Please provide a screenshot of the TXN ST06 .
You have mentioned that users are facing performance issues when executing certain transations . Have you done a trace for these transactions /users using ST12 or ST05
Please Dig in more using transaction ST03N / STAD . You will get more details
Response Times: Rules of Thumb - CCMS Monitoring - SAP Library
All performance problems may not be memory . It could be CPU , network etc .
Thanks ,
Manu