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free ram is wasted ram...
apps will work faster if they are already in memory as it will not need to load.
If you are not using it = it is in idle state, Android will clean it itself - apps not used for long time or Android will do this in case you will use entire ram memory.
All task killer are pure garbage and harm to your operating system, also it is only causing additional and unnecessary battery drain.
Please uninstall any 3rd party task killers to fix the issue.