Android 4.2 is without a doubt one of the most buggiest release from Google ever. The latest version of Android is filled with bugs and instability issues including random reboots, minor bugs, performance issues and much more. Nexus 7 users, in particular, have been facing severe lag issues on their tablet ever since they installed the Android 4.2 update.
Thankfully, an XDA member – fishingfon – has a very simple fix for all the slowness and lags that Nexus 7 owners are facing post the Android 4.2 update. The tip is to actually disable background syncing in Google Current, which somehow magically improves the performance of the device.
To disable background syncing, simply open Google Current on your Nexus 7, press the Settings menu/the 3-dots button in the top-right corner of the app, and uncheck ‘Enable Background Syncing’ from within the Settings sub-menu.
If you don’t use Google Currents regularly, I would suggest you to simply uninstall or disable the app altogether.
Via – XDA