After a day to a few days, the n7's performance will degrade sharply to the point where a reboot is necessary for the device to function properly.

I've tried numerous ROMs, a few kernels, tweaking CPU governors (mainly just to performance) yet no matter what I try it will work great for a while but if I let it sit idle for a day or so load times for doing anything jump up to unacceptably slow levels.

By unacceptably slow I mean on the order of magnitude of 10 times longer than normal or more. UI elements and the UI itself are often unresponsive to very slow and even when it catches up to the first command (ie home button), the next command still takes just as long (ie loading an app).

This is a single user device and has very few apps and fewer running. There is always lots of free ram usually 50% or so.

Right now it's running lollipop (ART) but no difference.

Is there something I can do so I don't have to reboot every day?

How can I diagnose what component(s) specifically need the reboot to begin functioning normally again?

  • When you say degraded performance, what is your base for measure? I have MultiRom on my Nexus 7 Grouper, with 5 different ROMs (varying from JB to Lollipop) and I haven't noticed any performance issues. Have you looked at what background services and broadcast receivers are running? Also, what what apps do you have installed? Maybe an app with wish-washy permissions.
    – HasH_BrowN
    Jan 21, 2015 at 5:41
  • Also ART has been known to have performance/compatability issues as well. There are some ROMs that will work with ART, but that would be a matter of reading some forums. I use Dalvik because of smooth compatibility. :)
    – HasH_BrowN
    Jan 21, 2015 at 5:46
  • That bodes well. My base for measure is a fairly smooth and responsive UI where it only takes a second or so to do something like go home, open the recent apps screen, or load an app instead of 7-10+ seconds. Have you left a few of those ROMs totally idle for a few days? It may actually be more like 3 days when it starts to suffer. I haven't looked closely just enough to see that only what I would expect to be running is running. I am essentially running pure android + google. Even running totally stock from a factory reset I still saw the same degradation.
    – Enigma
    Jan 21, 2015 at 15:20
  • 1
    Here are 2 links with excellent info on this 1) and 2)
    – HasH_BrowN
    Jan 21, 2015 at 17:31
  • 1
    On the TRIM script there is a bug/problem, so there is a fix on the link I posted for the script. As usual read everything. :)
    – HasH_BrowN
    Jan 21, 2015 at 22:38

1 Answer 1


I set up auto fstrim with Device Control [root] and after a few weeks have not seen the same degradation I was seeing before. I am running CM12 lollipop nightlies.

You can set it up in Extras >Filesystem :

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  • How is it still running after having it set up the auto fstrim?
    – HasH_BrowN
    Feb 13, 2015 at 5:17
  • Should it not be?
    – Enigma
    Feb 13, 2015 at 13:57
  • No, is it still working great or has there been any hang ups since them? So its a long term fix? I just wanted to know as far as a follow up. I have 2 N7's.
    – HasH_BrowN
    Feb 13, 2015 at 16:18
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    @HasH_BrowN: Been running solid since - highly recommended. You'll maybe still get a slight, and I mean slight, initial lag when first touching the thing but it is miles better overall.
    – Enigma
    Feb 13, 2015 at 16:33

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