I've noticed that after receiving the Jelly Bean update for my VZW GS3, my Gmail app tends to use a lot more cpu. It sits in the background with a steady 2-5% cpu usage. I've tried lowering the number of days to sync and other tweaks, but can't figure out what's causing it. The only way to avoid it seems to be to back out of Gmail, rather than hitting the home button to navigate away. Has anyone else noticed this?