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After the update to android 4.2 my nexus 7 became slower.

Switching applications takes some seconds and even the menu that pop-ups after I push the 'share' button takes a while to appear.

Is there something I can do to have its performance back to the usual level?

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I had the same problem, and noticed that "prey" (play.google.com/store/apps/details?id=com.prey) seemed to be using more CPU than I expected. I uninstalled it, and things might be a bit faster now. –  offby1 Nov 18 '12 at 22:28
    
@offby1 how can I track the CPU usage of my applications? I don't have Prey installed, so it may be another application that is still not fully compatible with Android 4.2. In my case it may be Set orientation that sometimes crashes, but I'd like to be sure before saying that it is the culprit –  mariosangiorgio Nov 18 '12 at 22:37
    
* Swipe down from the upper-right, to display the 3x3 grid of shortcuts * Tap "Settings" * Tap "Apps" * Swipe left to look at the "Running" column * Examine the numbers in the right column -- they tell you how much CPU time the app has racked up. Look for really big numbers :-) –  offby1 Nov 19 '12 at 2:21
    
I don't get the display of that 'running' window... There is always a letter in front of the numbers, e.g. F3:54:15. What does it mean? –  levesque Feb 13 '13 at 14:04
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1 Answer 1

up vote 2 down vote accepted

As with all updates, the first thing that comes to mind is factory resetting the device. This clears all the remnants of the old version out of the system and resets app data that could cause inconsistencies. The downside is you'll lose all your apps and their data.

Normally I only do a factory reset in between major versions (3.2->4.0, 4.0.2->4.1 etc.), but if minor updates cause trouble, this would be a first step for me.

Oh yeah, the reset can be found in Settings -> Backup & reset -> Factory data reset. Note that while this usually doesn't affect your sdcard (including internal storage), some devices may wipe that too. But not the Nexus series, so you're safe.

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Is there any drawback in factory resetting the device? Am I going to lose any setting of they are not affected? –  mariosangiorgio Nov 21 '12 at 14:00
    
Yes, it will clear your settings if they are not synced to Google's backup, your installed apps and their data. Basically it will be just like when you first started using it, except that the internal storage will not be cleared. –  onik Nov 21 '12 at 14:07
    
Is Google's backup enabled by default? –  mariosangiorgio Nov 21 '12 at 14:30
    
I can't remember, but you can see it in the Backup & reset section of Settings (Backup my data) –  onik Nov 21 '12 at 18:00
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Sorry, I thought that was implied by "The downside is you'll lose all your apps and their data" and "Basically it will be just like when you first started using it[...]". –  onik Nov 22 '12 at 6:52
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