I'm using an XT897 CM11 lightly. I update directly from stock rom. I'm satisfied but i have one big problem.
Whatsapp, Hangouts, GMail etc it is syncronizing very late when my screen it is turned off (The option "Turn off data connection when the screen is off" it is disabled). I'm receiving the messages/emails but after some time can be also 1 hour.
This is happening on Wi/Fi and Mobile Data ! For battery life i'm using 2G/GPRS
Some ideas ?