Hi there, its been quite irritating to manage RAM on my Samsung Galaxy S4 GT i9500. This is run by 4.3 jellybean version. I ain't a game freak. But the RAM memory goes up to 90% slowing down the working speed. Never watch online or YouTube videos. Just browse internet and Facebook. But the pre installed apps start running in the background even if I force close it. I can disable the app in the setting. But it says 'doing this will make other app malfunction'. So l am afraid to disable. I am using 'clean master' to boost memory. But not satisfied. Please help me guys !!!