After upgrading to Lollipop my N7 was completely useless. It would take MINUTES just to bring up the settings app – and i am not exaggerating for dramatic effect. It was seriously that bad.
It was so slow I just shoved it under the bed and forgot about it for a few weeks. Finally decided to try and figure out what is up, I saw a few posts that suggested to try TRIMing it. Well, let me save you some time now, the N7 doesn’t support TRIM, so don’t waste your time.
While doing this, even though my device was prerooted and unlocked from many previous installs, it turns out that my root was disabled. Not only that, Root is now an actual option in the Android Settings which leads me to believe the hacky root enablers are no longer needed. I found all this out when I was getting ready to reroot/unlock the device over USB by enabling USB debugging. However the moment I enabled root in Android Settings, my N7 started going super fast just like it was new. Brilliant!
I would also suggest disabling Adaptive Brightness, as I noticed that my framerates suffer a bit while it sits there constantly dicking with its brightness while sitting on the desk in a bright room.
So, give that a try. Here are some screenshots so you can figure it out since they moved everything in Settings this release.
First open up Settings > About Tablet. Then tap on the build number field 7 times to enable the Developer Options.
After that hit the back button, now you should have a Developer Options menu at the very bottom of Settings. Open that and enable Root access for all the things.
After doing this if you are using SuperSU like you should, SuperSU will be able to update the SU binary. Then reboot. Hopefully, like me, you will enjoy your “fast” tablet after this, as well as all your crap being able to be full featured again.
No matter what this tablet is going to be slow the bigger Android gets, remember how cheap it was when we bought it? At least it is usable now and that is what matters to me.