I notice some post's talking about high Ram usage in JB. This is some thing I did to get things tip top.
1) Clean out cache
2) Clean out Memory
3) Make sure apps are updated (Specially since afterJB upgrade)
4) Some nefarious apps like to run CPU through the roof (Asphalt 7 is prime for this!)
5) limit screen pages and create folders I.E. (games, productivity, Google Apps, Productivity) I found with these 4 folders I can get by with 1 screen (Nice)
I haven't run into any other isssues thus far. I am going on 30+hrs on a full batt. w/o batt saver.