I don't want this to turn into a bitch-fest - because I personally have been getting on average about 15h + a day as a moderate user and think this phone/OS combo is capable of more.
I'm relatively new to Android and while there are posts in other forums none of them relate to GN/ICS. There are so many settings to play with and many of them might otherwise go unexplored and unexplained to a lot of users.
A perfect example of this is something I read elsewhere earlier tonight in another rant-based thread. Someone suggested turning Developer Options> Background Process Limit to "At most, 3 processes". I gave that a try and in both instances I got a SOD (not immediately but I'm thinking it may not be sound advice after all).
Something else to consider might be stock apps which are safe to disable.
Things that are known to work or have a majority consensus will be compiled into a list in this thread.
To make things easier, try use a path to the setting you're talking about: Settings > Apps and suchlike.