yashsingh1/xdaforums huggingface dataset:
[Nexus 7 Q&A, Help & Troubleshooting] danny8:
I'm pretty satisfied with Lollipop on my Nexus 7. It seems to have taken a slight performance hit, but the new OS is better overall.

I do not have massive lags or stutters as some have reported. New slowness is apparent as an extra second or two (which is quite noticeable) for first-time app launches.

My main problem is lack of bluetooth connectivity. To be fair, I also had this problem with my previous KK-based ROM, called Mahdi ROM. If I recall correctly, bluetooth was also broken for a few weeks during the evolution of CM11.

I hoped to see if others were also having BT issues, but I haven't scoured this entire thread. I wonder if my BT hardware is busted? It worked at one time...

Upgrading to Lollipop was an ordeal. It took longer than I expected. In the past I never had this many issues performing an installation or upgrade.

BUT, it was high time to wipe my slate clean. I'm rethinking my apps vs. content balance, given my N7's paltry storage.

I'm doubtful that I'll invest much time in future updates, although CM12 might tempt me in the future.

--

Installation experience

I used Wugfresh's NRT to install a Lollipop image to my 8 GB Nexus 7 (2012, wi-fi only).

I tried installing via adb, but somehow I managed to screw it up. My tablet had no OS.

I then used fastboot transfer (again, with NRT). That worked. However, I still had more problems to undergo.

The first-time boot (lengthy) opened to a password-entry dialog. Pressing enter with no password, I was informed that my tablet was encrypted, and a system reset would have to be performed.

A restart was followed by ten minutes of booting. The tablet was ready to go. I played with Lollipop a while, and then used NRT to reroot the device and reinstall TWRP.

I haven't had any issues since that time.

---------- Post added at 01:04 AM ------------

Yes, the 0% seems "normal".

I only have 14 MB free on my system partition.
[Nexus 7 Q&A, Help & Troubleshooting] CatThief:
The slowness is unbearable - lags, stutters, delay starting apps. I'll be rolling back to KitKat asap.
[Nexus 7 Q&A, Help & Troubleshooting] Indha Lezzio:
Looks like my tablet is special.

After a clean install with NRT and rooting have to say that I have no lags, 95% deep sleep with less than 0,3 battery / hour.

It's like a new tablet.

I've no tried bt but everything I've tried works really good.

I'm really looking forward to metallice's kernel in order to even improve my new n7

Cheers

Enviado desde mi GT-I9505 mediante Tapatalk
[Nexus 7 Q&A, Help & Troubleshooting] anderuc:
Any advice should I upgrade? Currently stock kit kat, already having lags.
[Nexus 7 Q&A, Help & Troubleshooting] 19dragon98:
If you are on ext4 you have like 0% system memory free but with f2fs i have got like 150 memory free... And nexus now fly also with Lollipop
[Nexus 7 Q&A, Help & Troubleshooting] ZEII:
Can you tell me how to flash stock rom with f2fs?

Thanks.
[Nexus 7 Q&A, Help & Troubleshooting] danny8:
If you have access to a Windows PC or laptop, take a look at Nexus Root Toolkit by Wugfresh.

Despite its name, you don't have to root your device (or be rooted) to use it. NRT may be used for various tasks, including returning to KitKat (or other) if you don't like Lollipop.

I don't know how to change your file format to f2fs. I presume it requires reformatting your device while tethered to a computer with a USB cable.

I would advise against messing with your file system unless you're an expert, or willing to do a lot of reading (if something goes wrong).
[Nexus 7 Q&A, Help & Troubleshooting] vishuhtc:
Attached benchmark tests using lollipop on nexus 7
[Nexus 7 Q&A, Help & Troubleshooting] danny8:
I'm out of my depth here, but those benchmarks – interesting as they may be – do not convey the performance, or lack thereof, of the Nexus tablet.

Most of the performance issues people are having with their Nexus tablets arise from disk/ROM accesses becoming painfully slow.
[Nexus 7 Q&A, Help & Troubleshooting] stranded.eu:
Guys dunno if it's placebo but after I've cleaned the cache in the recovery mode (after installing fresh image from the google site) 5.0 works a lot smoother. Apps do not lag like they used to few days ago. How come?

Also I've disabled most of the google apps, I only use GMail, Maps, Keep and Chrome.
[Nexus 7 Q&A, Help & Troubleshooting] C0derbear:
The geekbench stuff would only really be useful comparing the same n7 2012, 5.0 vs 4.4.x stock vs 4.4.x f2fs, comparing it against anything released afterwards isn't helping this discussion IMO.
[Nexus 7 Q&A, Help & Troubleshooting] khaytsus:
Um. What? The official 5.0 for the Grouper released a week ago.

System is full. It doesn't matter, it's a read-only file system.
[Nexus 7 Q&A, Help & Troubleshooting] Dark Jedi:
I was under the impression that lolli for the grouper was delayed. That the lolli ROMs was built from the nexus 4.
[Nexus 7 Q&A, Help & Troubleshooting] 19dragon98:
Follow this instructions http://xdaforums.com/showpost.php?p=56822760&postcount=518
[Nexus 7 Q&A, Help & Troubleshooting] frankusb:
Could someone who thinks their tablet is running well do the below experiment (if you are comfortable with adb)?

With adb logcat running, from a shell run:

am broadcast -a android.intent.action.ACTION_IDLE_MAINTENANCE_START

This should trigger fstrim

On a tablet with terrible performance the below log is generated:

11-13 17:27:39.311 D/AndroidRuntime( 4287):

11-13 17:27:39.311 D/AndroidRuntime( 4287): >>>>>> AndroidRuntime START com.android.internal.os.RuntimeInit <<<<<<

11-13 17:27:39.329 D/AndroidRuntime( 4287): CheckJNI is OFF

11-13 17:27:39.449 E/memtrack( 4287): Couldn't load memtrack module (No such file or directory)

11-13 17:27:39.449 E/android.os.Debug( 4287): failed to load memtrack module: -2

11-13 17:27:39.506 D/AndroidRuntime( 4287): Calling main entry com.android.commands.am.Am

11-13 17:27:39.514 D/AndroidRuntime( 4287): Shutting down VM

The memtrack errors are not present on a Nexus 5. I am curious if this is Nexus 7 specific and if it's only happening on some tablets (OTA vs factory image?)

thanks,

Frank
[Nexus 7 Q&A, Help & Troubleshooting] CatThief:
That would involve wiping data though, wouldn't it?
[Nexus 7 Q&A, Help & Troubleshooting] 19dragon98:
I dont think wiping data will improve
[Nexus 7 Q&A, Help & Troubleshooting] a3des:
Horible performance after clean flash on 32Gb version.

Uninstalled launcher (switched to nova), google launcher and wiped the cache.

Major performance improvement after this small tweaks.
[Nexus 7 Q&A, Help & Troubleshooting] djtinxo:
I also have to say that after almost a week with Lollipop perfomance has improved A LOT. In the beginning it was laggy and slow, but now it seems like the system has been stabilized.
[Nexus 7 Q&A, Help & Troubleshooting] CatThief:
Well that certainly is encouraging. I was 'this close' to starting over with a clean flash of KitKat. Now I think I'll just wait it out and see if things get better.
[Nexus 7 Q&A, Help & Troubleshooting] ozzydtm:
Have been using it a week and it seems to settling in just great. First day was a little laggy but not so much now
[Nexus 7 Q&A, Help & Troubleshooting] sinple:
The lag became better after I've sure the tablet has at least 2gb free space. Maybe people can try?
[Nexus 7 Q&A, Help & Troubleshooting] CatThief:
More encouraging news. Thank you!
[Nexus 7 Q&A, Help & Troubleshooting] cpvm:
Lollipop on my nexus 7, after 4 days...
[Nexus 7 Q&A, Help & Troubleshooting] cpvm:
I exactly do the same thing, and its working smooth....
[Nexus 7 Q&A, Help & Troubleshooting] a3des:
Like I said before, I have uninstalled system default Launcher (using nova).

I saw that others unistalled phone apk, google wallet, so I'm asking you guys, what other system apps are safe to remove from device.

Defenatly i will remove phone apk too, because there is no point for that on our tablet.
[Nexus 7 Q&A, Help & Troubleshooting] inuZ:
Running 5.0 with Nova, it`s like havong a news tablet :D

So damn smoooooth~
[Nexus 7 Q&A, Help & Troubleshooting] optimus 1:
My tablet is 16 GB, but after flashing lollipop it is seen 6gb. Why? How can i solve this problem?
[Nexus 7 Q&A, Help & Troubleshooting] cpvm:
Do a factory reset..
[Nexus 7 Q&A, Help & Troubleshooting] CatThief:
I tried but just couldn't take it anymore. Last night I wiped everything and flashed the KitKat 4.4.4 factory image. Now I have my beloved Nexus 7 back and it feels just like new.

5.0 works great on my Nexus 5, but on this device it's been nothing but a LolliFLOP for me.
[Nexus 7 Q&A, Help & Troubleshooting] nlaplante:
I can confirm that in my case reverting to stock launcher from Google Now launcher made a drastic improvement!
[Nexus 7 Q&A, Help & Troubleshooting] petenatas:
Working fine with Greenify and Nova Launcher
[Nexus 7 Q&A, Help & Troubleshooting] ariesgodofwar:
Anyone else using multiple user profiles and noticing what seems to be a great disparity in performance between they primary profile, and the secondary profiles? I have no issue on the primary, and it is quite good, but if I am on the secondary profile, it is lag city, even after I FSTRIM'ed. Weirdest thing, maybe it is just me.
[Nexus 7 Q&A, Help & Troubleshooting] cile1977:
Huh, I have many problem with multiuser setup (3 users) but it seams that it gets better with time - like system needs time to do something to start working properly.

Also, if you reboot tablet and enter one of the users, go to running apps and you will see there are no processes of the other users. But once you log into other user(s) you will see processes of the user you logged out running. And you can not killed them. So, you loose 100MB of RAM (at least) to users that are not logged in :( Why there is no option to completely log out from users!?

Also, I think that Facebook app is problem as well as Farm Heroes Saga. Wife plays Farm Heroes Saga on her (secondary) user account and she must kill it in recent apps stack. If she press home button everything stops, if she press back button and use game option to exit everything stops also...

That's why I think that it is not just problem in Android 5 but in apps that are not updated - for new version of Android and/or for multiuser setup.
[Nexus 7 Q&A, Help & Troubleshooting] cadboncopyvw:
OK, after a brief "holiday" back on SlimKat I've gone back to Lollipop and it is loads better. What was different? Well, I used NTR rather than doing it manually this time and NRT rebooted back into the bootloader after flashing each individual partition rather than updating bootloader, rebooting then doing the rest of the partitions - I can't see why this would make a difference though?!?!?!?

What is more likely to be the fix is that I changed the filesystem of each partition in twrp to f2fs and then back to ext4 and did a repair before I flashed. Perhaps I had some nastiness hanging around from a previous flash.

I did of course get the "6GB bug" but that's fixed easily enough and the tablet appears to be performing fine apart from the facebook app which appears to be very slow on lollipop. Anyone got the facebook app running well? Mine takes roughly 10 seconds to start every time.
[Nexus 7 Q&A, Help & Troubleshooting] Stresa:
The Facebook app definitely has issues on lollipop, it's not just you.
[Nexus 7 Q&A, Help & Troubleshooting] Android.is.better94:
I have no issues at all made this old tablet run like new .....for those of you experiencing slow downs, laggyness and so on just wipe your cache partition and if that doesn't work do a full wipe either way one of them will work because lollipop runs great on the nexus 7 2012 !
[Nexus 7 Q&A, Help & Troubleshooting] CatThief:
Did all of that. None of it helped. Odd how it seems to work for some yet not others. If we're starting "clean" then all devices should be identical.
[Nexus 7 Q&A, Help & Troubleshooting] C0derbear:
Actual state of the flash, at a low level, probably isn't. Anyone have a secure wipe tool?
[Nexus 7 Q&A, Help & Troubleshooting] SLHQC:
Install nova launcher

My experience after doing a dirty flash using wugfresh's toolkit is that lag was so bad as to make the tablet unusable.

I found that the single biggest improvement was to delete Google Now Launcher, disable stock launcher and install Nova launcher.

Tablet now runs as smooth as can be expected.

FWIW I also cleared cache from recovery, uninstalled a bunch of system apps and tried the stock launcher. None of these seem to have made much of a difference. Switching to Nova was the big thing. Night and day - tablet useable again.

Plus it turns out it's a cool launcher, very easy to tweak and I like how you can position icons on the homescreen in that "offset" kinda style.

Facebook still terrible though, but it seems that's the app, not lollipop.

Mine's a 32gig wifi model.

Cheers all...
[Nexus 7 Q&A, Help & Troubleshooting] gk1984:
I didn't try this but have been using Lag Fixer since updating to Lollipop which also manually executes fstrim to restore performance.

I'm starting to wonder if trim is broken on this device. When trim is run manually, it's a pretty large amount of bytes cleared. I thought this function was automatic. If it were, I'd expect a lot less to be trimmed. This is after being idle for a whole day too.

Something isn't right...

Performance seems to be at its worst after being idle for a few hours and fstrim fixes it for the most part...
[Nexus 7 Q&A, Help & Troubleshooting] cile1977:
Cannot boot after OTA

After fighting with performance problems after OTA on my Nexus 7 (grouper 32GB), this morning it will not boot. I can enter bootloader but cannot enter recovery - i choose recovery in bootloader and it just writes Android on screen and stays like that forever. Tablet was never rooted or anything like that. I still have warranty so I will take it to the shop. Is there something that I can try to fix it before I take it to the shop (something that will not void warranty)?
[Nexus 7 Q&A, Help & Troubleshooting] cile1977:
Switching off Googles location data retrieval to boost speed

Has anyone tried this solution for lag (from reddit):

"Have you tried switching off Googles location data retrieval ? This seriously gave me a speed boost, it is actually running smoother than KitKat right now. Just switch off locations in the pull down menu, switch it back on and when Google asks to keep it running in the background for data retrieval just say No."
[Nexus 7 Q&A, Help & Troubleshooting] FunkyMuse:
I get like 23k on antutu and when I try to run Asphalt 8 it won't even open.
[Nexus 7 Q&A, Help & Troubleshooting] xxbeanxx:
My tablet was running like ass yesterday. I disabled location, to save battery, and am noticing a big difference in performance this morning.

You may be on to something, cile1977.
[Nexus 7 Q&A, Help & Troubleshooting] frankusb:
I've since found that the memtrack error is due to the memtrack HAL not being present in grouper's system image. So this error message should happen on everyone's device, regardless of upgrade method. What I have not determined is if this is why fstrim does not appear to be working.
[Nexus 7 Q&A, Help & Troubleshooting] frankusb:
Well, fstrim is working on my tablet, I finally found it in logcat.

I/MountService( 467): Running fstrim idle maintenance

I/fstrim ( 128): Starting fstrim work...

I/fstrim ( 128): Invoking FITRIM ioctl on /cache

I/MountServiceIdler( 467): Got mount service completion callback

I/fstrim ( 128): Trimmed 444338176 bytes on /cache

I/fstrim ( 128): Invoking FITRIM ioctl on /data

I/fstrim ( 128): Trimmed 4499714048 bytes on /data

I/fstrim ( 128): Finished fstrim work.

I will note that my free space is pretty close to the amount that was trimmed. Maybe Lollipop writes way more?
[Nexus 7 Q&A, Help & Troubleshooting] gizzmoffm:
I think that is how fstrim works: It collects a list of unused blocks from the filesystem and sends this list to the flash controller.

I don't think it is even able to check what had been written since the last trimming - that would be too complex.
[Nexus 7 Q&A, Help & Troubleshooting] brian Marshall:
I'm finding the general OS interface will be laggy at times, but I'm not sure it's any different than kitkat.

Opening an app or switching between then can be dreadfully slow at times.

BUT I've noticed chrome performs WAY BETTER. It was (along with most other browsers) nearly useless with kitkat.

Once I'm in an app it seems fine.
[Nexus 7 Q&A, Help & Troubleshooting] gk1984:
Can we add memtrack HAL? Can we pull it from another device or something? Or is this something better to report to Google as a bug?
[Nexus 7 Q&A, Help & Troubleshooting] frankusb:
Another Tegra 3 device with the same video driver, possibly. It's probably an Nvidia issue.
[Nexus 7 Q&A, Help & Troubleshooting] PerfectSlayer:
I tried to install Lollipop from factory image coming form KitKat without wiping user data (remove -w of fastboot and erase userdate) and I got very poor performance...

I just reinstall from factory image without keeping data (left flash all script untouched) and my N7 runs really smooth now :good:
[Nexus 7 Q&A, Help & Troubleshooting] bftb0:
Oh, *now* I see what you are saying.

If the only time the pages are TRIM'ed is when a periodic user space daemon is run, then you might expect the space trimmed to be less than the free space in the filesystem if file write activity was low over the interval between successive runs of the TRIM daemon. After all, I think it would be a wear hazard to re-erase pages that were already erased (is it only the write cycle, the erase cycle, or both which cause wear?)

But that observation might be simply a consequence of wear-leveling, no? Whatever pages are free for use, the next selected for write should have the lowest write count, so as free pages are churned through by filesystem write activity - e.g. create() and unlink() - the wear leveling has the effect of spreading out the FS write activity across unallocated pages almost in a (statistical) round-robin style, rather than churning through some random & smaller subset.

It does make you wonder if that daemon is scheduled to run often enough though, right? Either that, or it simply is reporting the "free space visited", whether or not it actually encountered pages that were unerased?. Or, there is no wear hazard due to erasure, and a "dumb" algorithm which just erases everything in the free space is all that is needed?

If there was a way to retrigger it immediately after it was most recently run, that might shed some light on the above (speculation).
[Nexus 7 Q&A, Help & Troubleshooting] Bert98:
+1. For me it runs way smoother than KK, but Chrome performance really blew me away. I can finally open a webpage in less than 1 and a half minute :D

Inviato dal mio Moto G utilizzando Tapatalk
[Nexus 7 Q&A, Help & Troubleshooting] SugarNY:
Erratic

Erratic performance. Did a complete swipe and installed clean stock image. Rooted with NRT.

Slight improvement from 4.4.4. (device was regularly freezing) but still frustrated.
[Nexus 7 Q&A, Help & Troubleshooting] PumaPerez:
I struggled with terrible performance too. What I did:

Wiped everything in recovery (even system)

Then boot into bootloader

Then flashed stock rom via fastboot via NRT (half-brick option ticked)

Then I did root

And after all that I used LagFixer on all partitions.

Now my nexus 7 is very usable, nearly new experience ;)
[Nexus 7 Q&A, Help & Troubleshooting] RusherDude:
My N7 went from perfect on Kit Kat (extremely smooth, just perfect), to slugish on Lollipop.

The system animations are ****ing smooth yes, but after the animation finishes, it takes seconds to the action to perform.

Wiping Cache or nights of trim'ing didn't fix much. Really do google want to kill this tablet already?

PS: I have read that rooting and deleting system stuff helps, but if we won't wanna root this, we're screwed???
[Nexus 7 Q&A, Help & Troubleshooting] beint:
It was like that for me as well, I did a factory reset from the menu and after that, everything is smooth again. Even after I installed apps, still smooth. And I'm not rooted.
[Nexus 7 Q&A, Help & Troubleshooting] owziee:
Might sound weird but my nexus 7 ran terrible with lag and all that after the lollipop upgrade (ota).. System restore, wiping cache and etc.. Nothing helped. I was to lazy to flash kitkat again.

Now 2 days later it runs super smooth all of a sudden, just like magic.. I haven't changed anything. Facebook app still takes ages to load but other than that my aging n7 (2012) feels really snappy again.. I've also noticed that 3d gaming performance is slightly better than it was in kitkat... :)

:: UPDATE :: After uninstalling facebook aswell as messenger (fb) it runs even better for some reason.. Feels just like it was when it was new.
[Nexus 7 Q&A, Help & Troubleshooting] RusherDude:
Now it runs better not because magic, but because google play services got an update that fixed some stuff (or deactivated some stuff for the N7).
[Nexus 7 Q&A, Help & Troubleshooting] SkOrPn:
Yeah, I never could use Chrome on KK, so I just stuck with Dolphin and Firefox, and sometimes Javelin. However, when I upgraded to LP I started to think maybe Chrome would work better and once I installed it could not believe my eyes. Its almost like Chrome is not made for anything but Lollipop, LOL.

All kinds of slow apps now perform within reason on LP. I think as the kinks get ironed out of LP, Kernels become more mature for LP and 3rd party ROM's such as CM, Omni, Carbon, Slim, PA etc etc become widely available this device will finally perform like it should have back when it was released. Android L is more exciting then all the other Android releases to date :good:
[Nexus 7 Q&A, Help & Troubleshooting] SLHQC:
Is it my imagination or has the update to Google play services just fixed everything? My nexus 7 seems to be running better than ever!
[Nexus 7 Q&A, Help & Troubleshooting] bhatsunny1:
I just checked but there is no update
[Nexus 7 Q&A, Help & Troubleshooting] smartjais:
Has anyone else noted that the battery life has increased on lolipop .. I feel that its better even though even before nexus 7 has been good in this aspect.
[Nexus 7 Q&A, Help & Troubleshooting] mrm1:
I didn't have the update either so downloaded from here

http://www.apkmirror.com/apk/google.../google-play-services-6-5-87-1599771-438-apk/

My N7 2012 seems almost perfect now in comparison to before updating google plays services.
[Nexus 7 Q&A, Help & Troubleshooting] bhatsunny1:
Right. I have just installed it. Let's see how it goes.
[Nexus 7 Q&A, Help & Troubleshooting] PunishedSnake:
Is anyone running lollipop with f2fs?
[Nexus 7 Q&A, Help & Troubleshooting] Groid:
Based on the instructions from the referenced site, for the N7-2012 we should be using an .apk ending with .734 (216 dpi) and not the one ending in .438 (480 dpi). There is not one listed with the .734 designation. My current Play Services ver is 6.1.88 (1557022.734), last updated Nov. 21 and the Play Store lists no Play Services updates for my N7. Are there any issues, display or otherwise with your .438 version?
[Nexus 7 Q&A, Help & Troubleshooting] mrm1:
I've certainly not noticed any issues in any thing I have tried yet.

Other versions here but not tried any of them yet. Scroll to the bottom of the page.

There is nothing to say I won't have issues with this version but so far so good.

I might keep a look out for the correct version when it is released.

Use at your own risk.

http://www.apkmirror.com/apk/google.../google-play-services-6-5-85-1589008-038-apk/
[Nexus 7 Q&A, Help & Troubleshooting] Stresa:
With the lollipop update my battery run times are noticeably better. Battery usage in sleep mode has dropped to 0.3% per hour. That is orders of magnitude better than what I ever got with jellybean or Kit Kat
[Nexus 7 Q&A, Help & Troubleshooting] SkOrPn:
Agreed... Yesterday I took mine off the charger at around 10pm and set it next to the bed. This morning around 12 hours later I grabbed it and checked and the battery was at 98%. At that rate it would take 10 days to completely drain while in sleep mode, lol. I can't remember if I used it any before bed but I do not remember doing so.

I am on BSZAospLP v1.1 and M-Kernel a72 for what its worth, and overclocked to 1500 max and 304 minimum....