Hi Sukumar,
I can see you've already advised App Device Control etc is turned off which is good we can rule that one out,
Do you have any scheduled DAR scans targetted at all machines? Failing this you can throttle the agent and decrease it's store size to try and streamline their operations,

As you can see, RAM isn't mentioned as an option but by reducing the agent store size and throttling back network/CPU this may indirectly reduce the RAM usage also,
Hope this helps,