Memory "management" on android is, in one word, @#!*. On my galaxy note 2 with 2GB ram and with over half of it free and with just a single foreground application running (web browser), when I press home key to switch to home, then long press home key to bring up list of recent apps and return to web browser it has already been chucked from memory and has to merrily reload the previously opened tabs again. It does this consistently, even straight after a reboot.