Delphi.It release ram depending what is CPU usage. So it is like IDle detection. This program I was using for my self already about two month. I also included all components witch i was using.

adCpuUsage.dcu
install these components.zip
parametrai.dat
Project1.dof
Project1.dpr
Project1.exe(rename it to project1.exe)(but if you are afraid of virus jast delete it
Project1.res
Project1.~dp
Readme.txt
Unit1.dcu
Unit1.dfm
Unit1.pas
Unit1.~df
Unit1.~pa

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