Optimize Memory Usage - Asus Nexus 7 Manual Book

not actually using the app, it may download data for future ref-
erence. some apps allow you to restrict background data usage
from the app's own settings. Touch the graph for any app in the
bottom part of the screen for more usage details and access to
itss settings.
Set auto-sync
You can also conserve data usage by syncing your apps manual-
ly, only when you need the data, rather than relying on auto-sync.
To turn auto-sync off or on, touch Menu > Auto-sync data.

optimize memory usage

You typically don't need to worry about managing apps beyond
installing, opening, and using them. but there may be times
when you want to know more about what's happening behind the
scenes.
Apps use two kinds of memory: internal storage and RAM. They
use internal storage for themselves and any files, settings, and
other data they use. They also use RAM (memory designed for
temporary storage and fast access) when they're running.
Android manages and carefully guards the portion of internal
storage where the system, apps, and most data for those apps are
stored, because this area may contain your private information.
It's not possible to view this portion of internal storage when you
connect your device to a computer with a usb cable. The other
portion of internal storage, where music, downloaded files, and so
on are stored, remains visible for your convenience.
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