yashsingh1/xdaforums huggingface dataset:
[Nexus 7 General] burnduck:
Let me give an update of what I've tried.

My N7 slowed down three (3) times already. And the only solution I've found so far is to do a factory reset.

The second time it slowed down, before I did the factory reset I tried the following:

- Uninstalled all apps in Settings -> Apps -> Downloaded

- Removed all updates to stock apps

- Deleted all user data (music, movies, etc)

- Removed all Google, Facebook, Twitter accounts

- Disabled syncing and turned off WiFi

- Restarted tablet by turning off and on, as well as holding all three hardware buttons

Ran Androbench again, and I got exactly the same slow Sequential Write + Random Write speed.

Last time it slowed down I went into the bootloader and removed cache files. Also no joy.

My observation is the device seem to slow down along with usage, not necessarily when the device is packed of data, slightly similar to SSD getting slow when files are fragmented and writing blocks are not sequential anymore.

Edit: I also have a Before and After benchmark for my tablet.

Before I did a factory reset:

SEQ RD: 16.61 MB/s

SEQ WR: 0.37 MB/s

RND RD: 1167.35 IOPS (4K)

RND WR: 14.27 IOPS (4K)

SQL Insert: 4.17 TPS

SQL Update: 10.25 TPS

SQL Delete: 21.99 TPS

Browser: 3354.0 msec

Market: 916.75 msec

Camera: 593.75 msec

Camcorder: 2230 msec

After I did the factory reset and restore with adb

SEQ RD: 23.61 MB/s

SEQ WR: 11.09 MB/s

RND RD: 1890.57 IOPS (4K)

RND WR: 129.33 IOPS (4K)

SQL Insert: 44.71 TPS

SQL Update: 53.17 TPS

SQL Delete: 54.54 TPS

Browser: 156.25 msec

Market 308.0 msec

Camera: 334.75 msec

Camcorder: 693.75 msec
[Nexus 7 General] mmoreimi:
Data Storage

Was data storage a factor at all? Out of curiosity, were you getting close to maxed out on your 16GB of storage?
[Nexus 7 General] burnduck:
I've purposely maxed it out a few times and I didn't seem to have noticed much difference, most of the times it's got about >5 GB free space left.

However the slow down seem to be related to frequency storage is accessed but capacity, I just put together all the results from androbench and revealed a slightly worrying trend. The slow down seemed inevitable.

Please let me know if my results are anyhow biased, I'd rather to take this as my user fault than a fault in all N7s. :rolleyes:

PS: Yes I am aware the X axis is not linear since I didn't run test on a daily basis, but still you can see a downward trend on sequential / random write.
[Nexus 7 General] sark666:
I wonder if this guy is on to something?

http://xdaforums.com/showthread.php?t=1880160

Is the cache folder a separate partition? If so, I wonder if androbench tests there? I would assume so. It would be nice if there was some write test utility where we can specify where to do the test.

Like others, I have the abysmal scores wtih writes in androbench. Sequential write: .39 MB rnd write: .02 MB.

If it could be something with the cache partition I wonder if there could be a way to wipe it and start fresh? Still not a fix, but an easier workaround than a factory reset.
[Nexus 7 General] khaytsus:
That's been disabled since day 1 for me.
[Nexus 7 General] dirk1978:
These are my scores from a non-restored stock nexus 7. It did lag terribly until I deleted some large apps and a large movie. Perfect now.
[Nexus 7 General] Cor-master:
From Another post I made in another thread. I can confirm that below 5 gig the system starts lagging. Anyone care to shed some light as to why?

from my HTC PH39100 using Tapatalk 2
[Nexus 7 General] kieso:
I'm no expert either but i've wondered about the partitions also. I learned some coming from a view sonic gtablet. Team DRH did some awesome things and made a lot of it happen by rearranging partition sizes. Does anyone know how nand works? Is it a constant sequential read from top to bottom? Or is there some type of table (like FAT32) referred to when called upon to access an app or data?
[Nexus 7 General] sg3707:
Update 1:

Rom: Stock 4.1.1

Bootloader: Unlocked

Free Storage: Around 10Gb

Rooted: Yes

I have Deleted all the Movies, Apps, Uninstalled most of them but still lag was present.

Androbench used to run for around 10 minutes to complete.

The most affected Sequential Write was around 0.31MB/s.

Update 2 :

Rom: Stock 4.1.1

Bootloader: Unlocked

Free Storage: Around 12.7Gb

Rooted: Yes

Flashed the stock 4.1.1 again. Restored factory settings.

Now everything seems fine. It is fast and responsive as usual.

Sequential Write is around 10.5MB/s. Androbench completes in 30-90 seconds.

One thing consistent in all the posts is that Lagging starts once storage is full.

Difficult for the tdevice to be lag free once lag starts. It will only reduce on removing data but it is not eliminated completely.

Has anyone has any Rom Kernel combination which is 100% lag free.

This lag issue must be highlighted more than the other Nexus 7 defects.
[Nexus 7 General] demandarin:
I have 4gb or almost that much left. I guess I haven't reached that low thresh hold yet.
[Nexus 7 General] fzammetti:
I think it would be fair to say that's GENERALLY true, but it's not 100% the case... for example, right now, my N7 is running slow, benchmark scores are low like many others, including me, have shown in the past. However, I have >9Gb free right now, having done a recent factory reset, and have never gone below that since the reset... yet here I am, a slow N7 again, after it was nice and speedy after the reset.

Now, I DO still think there is a valid correlation here because it's not QUITE as slow as it was the first two times when I got down below 4Gb the second time, or below 2Gb the first time, but it IS slow... so it does seem there is some relationship to how filled memory is and how slow it gets, but it doesn't appear to be QUITE as simple as a linear relationship or anything like that.

Then again, that's anecdotal on my part... all I know for sure is the damned thing has slowed on me for the third time and my frustration level *IS* linear :)
[Nexus 7 General] nemrel:
Are we sure that our abysmal AndroBench scores are because of our devices & not a problem with the way AndroBench is coded to work with 4.1.1? When I run AndroBench, my device is pitiful compared to other users with Nexus 7 & just about every other device AndroBench has been tested on. My device performs worse than an original HTC DINC or even my Eken M0001, which I bought almost 3 years ago. Does that sound right?

I have used other benchmarking tools & they each score my device in the upper 25% of Android devices. Is there another way or app to test the Read & Write speeds of our devices?
[Nexus 7 General] phcahill:
Comment on article on The Register

This would be a possibility if it was not for the fact that Androbench scores exactly match the user experience.

I and maybe others have managed to get an article published on The Register.

http://www.theregister.co.uk/2012/09/11/nexus_7/

However the commentards have missed the issue and think that owners are bleating that they only have 13GB and not 16GB or that it runs slow when 99% full.

Please comment on the article that write performance is still a tenth of what it should be, even when the file system is cleared down so that lots of space is free.

So far the only solution is a factory reset.
[Nexus 7 General] dirk1978:
But it's not! I had lag, really badly, then freed up some space and it was perfect again. Ran androbench and my write speeds were very low but it had no impact on the user experience.

I do wish people wouldn't state their opinions as fact.
[Nexus 7 General] phcahill:
It does get a bit better but nowhere near back to normal. I tried deleting a gig at a time and sure enough the androbench figures do climb back a bit.

If you then make sure all the necessary syncs are off (Currents etc.) then the tablet is usable. Then try a reset. It's back on steroids. My experience is fact because it happened to me.
[Nexus 7 General] Kumnaa:
I've had the same thing. Deleted several gigs and my results have improved but still nowhere near the results of my control device.
[Nexus 7 General] julien.me:
I have noticed this rtoo so I titanium backed up all my apps/data, did a wipe data from CWM, restored the data with TB and now my N7 is performing like on the first day, shame you have to get to drastic solutions like that though ...

funny enough, the random write rate figure from AndroBench didn't improve much after the factory reset, but who cares since it performs so much quicker now ... !
[Nexus 7 General] nemrel:
Personally I had horrible lag about two weeks after getting the device. Factory reset & rooted my tablet. Since then everything has been running fine, just like when I first bought it. However if you look at my current AndroBench scores they show my device performing in the lower 10% of all Nexus 7 devices. However AnTutu, CF Bench, & Quadrant all tell me I'm running an average Nexus 7, which makes sense since the only tweak I've done is to Root & install Touch Recovery. I haven't done any kernel or ROM tweaks at all.

Can some of you with horrible benchmark scores in Andro download & run another benchmark program like CF-Bench & see what it says? I'd like to see what the other benchmark program scores are for people who have 7's running like crap or with lag & for those who see horrible read/write scores in Andro, but their devices seem to run smooth (like mine).
[Nexus 7 General] R1ptide:
Androbench is inconsistent. I ran it and for like 2mbs write speed, restart the tablet and get 10
[Nexus 7 General] Stresa:
I have a 16GB N7 that I've been using since release day with 684MB free and I've never had a single instant of lag.

Whatever this issue is, it's more complicated than the amount of storage in use. There has to be something else involved here.
[Nexus 7 General] danlo:
I know I did have the lag issue, but right now I'm on EOS with about <400mb free, with no lag. I do see browser performance with JavaScript enabled being horrific. Maybe try and turn that off and see?
[Nexus 7 General] kingofthebraves:
I am getting more and more disappointed with my Nexus everyday. It has extremely slow data transfer speed via usb, weak wifi range and occasional lag brought about by the slow memory. It's like a beautiful i7 8gb ram laptop running on a 7200 rpm hard drive when everyone else is using an ssd!!

I swear doing some things like opening and closing music, videos, pics slows my unit to a crawl.
[Nexus 7 General] Cor-master:
7200rpm is bad now? Did I miss something?
[Nexus 7 General] demandarin:
Maybe people should list what apps they have also. To see if there's a consistent app everyone has. Could be possible cause of lag. Because it sounds crazy to me how somesaying opening up pictures or music or videos slows the whole device to a crawl. My device the exact opposite in that nature. TThat's the thing I loved about this device the most, how fast it is compared to how my prime was.

IMO, based on experience and owning them, Nexus 7 and new Galaxy note 10.1 easily has the fastest and most stable performing OS. Never have any lag issues with either.

Something else other than device itself is causing lag people mentioning. Or else everyone would experience it. Or at least more people.

Op should add a poll to this thread. A simple yes or no if major lag is being experienced. Maybe put some numbers with these claims.
[Nexus 7 General] slixzen:
I would say a google form or spreadsheet might work better.

I just did a Factory Data Reset (FDR), and from what I am experiencing, still getting a bit of lag. Hell, I even got lag (and an attempted force close) while trying to setup my google account on the device. Waiting for Androbench to download (been about a minute since I approved the install), so I will wait till then.
[Nexus 7 General] seeknom:
ignore
[Nexus 7 General] slixzen:
Google Form for gathering data:

https://docs.google.com/spreadsheet/viewform?formkey=dG5lTXFXNVpHeVlhMzg1b2tseUI4Smc6MQ

Results from Google Form:

https://docs.google.com/spreadsheet/ccc?key=0AnXlIPbyx6lgdG5lTXFXNVpHeVlhMzg1b2tseUI4Smc

Hopefully this can help narrow things down for anyone who has / was experiencing the issue.
[Nexus 7 General] castlefox:
Nexuz 7 Lag

*sorry if some of this was answered earlier in the thread, I power skimmed it.*

I have been experiencing "lag" as well my self. But the "lag" I am experiencing completely freezes my Nexus7 unless I wait for atleast 15seconds OR I hit the power button and then turn it back on.

I had 500MB of free room when I started to notice more problems. Now I have 1.6 GB of free space and I am noticing less lock ups but they are still happening. My Nexus7 is the 16GB version with the latest stock android version.

I think part of the problem is that encrypted my Nexus7 and that is greatly affecting I/O performance. Is anyone else experiencing problems with "lag" after encrypting your Nexus7? (anyone know how to turn encryption off ? )
[Nexus 7 General] JNeail:
So from what I can read here we're not yet clear on whats causing the slowdown/lag issue but with many thoughts linking this to free space?

My Nexus is:

- 16GB UK Version

- 1.8gb of free space (having deleted lots of stuff now now I've forced Google play/music to work in the UK)

- stock ROM

- not rooted

- has nothing odd loaded (twitter/facebook/onenote/a few other bits etc) and all from the official play.Google.com store except flash and BBC iPlayer (sourced from this forum)

Seems there may be other theories other than ram and io speed issues, but (and having called/mailed for support), both Google and Asus don't acknowledge these issues, yet the internet is rife with tails of woe like ours here!

So my question is - what are we able to do about it? Is here a way to en-mass register a complaint, surely there is a is patch that can fix this that Google can issue. I can't believe h/w is at fault here as the device isn't that unusual I.e same components in many other manufactured devices. Yet something is wrong, perhaps a petition, any takers?
[Nexus 7 General] androidkid311:
Heck if there is a petition I'll easily sign. But I saw a few pages back that you can complain to Asus directly :).
[Nexus 7 General] khaytsus:
Wifi range on my N7 is better than any of my other phones or previous tablets. Speed varies, it's slow as hell when the N7 is moving slow..

Factory Reset is the only way to "turn encryption off". Tells you that when you enable it. And yes, I imagine lag would be worse with encryption on, but it's not the cause.
[Nexus 7 General] 007xico:
My tablet got laggy when I filled the storage so I did a factory reset.

But it doesn't delete everything, music, photos and root still there.

How do I get it back as it was when I got it new?
[Nexus 7 General] ChrisM001:
Such a heavy defect and no reaction Form Google or Asus? Sad! I will return my device.
[Nexus 7 General] garpunkal:
I'm having the same problem :( seeing piss poor speeds... although I seem to be having the same problem on my Galaxy Nexus...
[Nexus 7 General] Kumnaa:
There's just been a semi acknowledgement on the product forum:

https://productforums.google.com/forum/#!msg/mobile/loqbCbKVMWE/P5drRUG6o8UJ
[Nexus 7 General] slixzen:
Thanks for posting that Kumnaa. Hopefully they can get it sorted, and if not, well, looks like we will need to sort it ourselves if possible.
[Nexus 7 General] Joezhang:
I'm experiencing the same issues - got to 3gb of space and it now is very laggy, especially if I reset and turn it back on. :(
[Nexus 7 General] frescagod:
i have 1.8 GB free and rebooted this afternoon, and the UI was extremely laggy, even after settling in. nothing was syncing, nothing was doing anything. it lagged with airplane mode on, with wifi turned off, etc. it would take 2+ seconds to load the app drawer, 10 seconds to load m.cnn.com instead of the usual 1, and swiping screens was really delayed. i turned off skype sync (i don't think that was the culprit), and then i checked chrome in settings > apps, and the cache was 144MB! i cleared it, and it was still lagging, so i shut down and rebooted again.

result? responsiveness went back to normal. i only tinkered with a couple of things, so next time it happens, i will just clear chrome cache, reboot, and see if it reverts back to normal.
[Nexus 7 General] aidanbree:
Hi,

Had the same issue as everyone else is experiencing and can confirm the instructions on the Jays buttery goodness thread work to resolve the issue. You need root though...

It's in the development forum
[Nexus 7 General] lordlad:
I have not fully verified that this resolved the 'lag' issue but here's what i did...

I got a Nexus 7 16gb, running stock, rooted, running Franco Kernel R6.....

got about 2.6gb free...what i did is i turned off fsync(). screenshot as below

with fsync() on:

with fsync() off:
[Nexus 7 General] ChrisM001:
Turning off fsync which is done in Franco kernel or some other receipts for buttery smoothness is no real solution as it may cause data corruption. Device should be able to show acceptable IO performance without this tweak.
[Nexus 7 General] lordlad:
i agree but in this case, i think the 'problem' is not due to android OS itself (since my Galaxy Nexus yield no such problem) but more of a hardware 'defect'.....now i put quotes on the word defect because technically, the hardware in question, which is the flash storage in itself, is working and not really 'breaking down'. However granted that Asus uses cheaper flash memory with pretty bad IO speed, i think it's pretty much that there's not much we can do about it. I don't think RMA from google will help too. For now, all we can do is apply all these minor hacks and tweaks and hope that their component quality selection will be much better in future nexus devices.
[Nexus 7 General] Jay Aristide:
While I agree it should be able to show decent I/o out of the box, I will say I've been turning off fsync and remounting /data noauto_da_alloc for years and never had a problem. If it works to alleviate the problem then it works to alleviate the problem. While I accept and acknowledge there is a hardware defect somewhere in the nand on a lot of n7s, if this fix works for someone and they're happy, you've no business discounting it.
[Nexus 7 General] hyperspacey:
I'm thinking this is a launch-era hardware issue due to a dodgy memory controller or something (or Asus cutting corners to meet demand). If people would be so kind as to post their build date/ serial from the inside of the back plate I'd appreciate it, maybe we can narrow it down to a release hardware problem and know we could replace it with newer units.

Mine:

Build date 2012/05/26

14007-00530400

3DC
[Nexus 7 General] ExploreMN:
I have to admit, I loved my N7 since day 1 and would sing to its glory, but the lag is getting a little annoying. For example, this thing simply cannot download an app in the background and install it without hanging the whole system. I mean seriously, my G1 was able to do that and the Fascinate I have laying around the house that's what, 3-4 years old now...no problem. I can't sync email while browsing the web, etc. So even though I have no other issues at all, I might be calling Asus today. This is simply getting too bad and there is zero evidence that Asus or Google is addressing the issue.
[Nexus 7 General] jetbruceli:
Hey all, I have come to the conclusion that if I have a root and cwm my device becomes laggy after some heavy gaming or useage. I relocked and went unrooted and no lag appears at all.

Not sure if it's a particular root app doing it or what. I just got my second n7 and will test both and report back

Sent from either Galaxy S3 intl or Nexus 7

both on stock at the moment!!

---------- Post added at 03:50 PM ---------- Previous post was at 03:49 PM ----------

Mine downloads and works fine. But even then, I don't usually do much when downloading.

Sent from either Galaxy S3 intl or Nexus 7

both on stock at the moment!!
[Nexus 7 General] JNeail:
Have spoken again to Asus UK Support today - and they have passed my issue to 2nd-line support but at this stage are still claiming to be unaware of any issues! Advise from support agent was to ensure I always ensure adequate free space, otherwise, just like a PC the device is likely to go slow....!! I did remind him of th 13.2GB I get to play with that means I only get around 10 before I run in to trouble - he didn't flinch!:crying:
[Nexus 7 General] sym_richard:
Experienced unusable laggy after storage space dropped to under 5Gb. After did the backup, unlock, root, factory reset, back to lighting speed.

Hopefully Google or Asus can release the fix soon.
[Nexus 7 General] mmaestro:
So I don't know how many of you have seen this, but Google just asked if they can see some of these Nexus 7s that are lagging. Obviously neither universal, nor something they've figured out the cause of, yet. Mine isn't lagging since the factory reset I did, but those of you who are suffering might want to hit this thread and offer up your devices if you don't mind them having your data. Apparently they'll ship a replacement ahead of time so you don't need to be without your tablet.
[Nexus 7 General] burnduck:
posted a reply there, really wish this is going to help them find the issue since I really like this little tablet :rolleyes:
[Nexus 7 General] MRsf27:
I roots my n7 today and OC it to 1500mhz and absolutely amazing now... even gears and guns aint laggy and that's what was bothering me before... also before I rooted it I noticed I had less then 1 GB on the device and it was still running smooth, maybe I got a good device
[Nexus 7 General] Cor-master:
Mine was noticeably laggier when I installed nova 3 and it took it down below 5 but it was still faster than any other Android device I've owned and still very usable. And when I uninstalled nova 3 the lag went away
[Nexus 7 General] slixzen:
Posted a reply. Hopefully, my device can help them out. Not sure he will take the offer since I didn't originally post in that thread. But we will see. Would be great to see if they could resolve it.
[Nexus 7 General] ExploreMN:
Wow, thought my lag was bad before. I took it to 1gb free space to test it. This thing is nearly unusable. Went back to 10gb free and, while better, its still much worse than before. Looks like it ANOTHER factory reset. That Kindle Fire HD is looking more and more tempting.
[Nexus 7 General] androidkid311:
Google getting serious!! I like that. Maybe they also want to stop this lag showing up in the 3G they will release. :). Thanks for the info!
[Nexus 7 General] sym_richard:
It's a surprise Google didn't realize the lag in their internal test, unless Asus provided different hardware(like SSD) in different time...
[Nexus 7 General] ExploreMN:
Or they just benchmarked stock units and never loaded up the storage. With a factory reset mine is fine....start to load stuff on it to use it and it becomes garbage. Funny it didn't don't his until now though....about 25 days past my last chance to return it...
[Nexus 7 General] czesiu:
I assume they can't replicate the problem internally so it must not happen with majority of the tablets.

Are there any Nexus 7 owners w/o this problem? (yes, I know it's not the best place to ask ;) )
[Nexus 7 General] IntegraR:
I.ve been getting this problem since day 2 after my purchase

wiping the cache may help for a day or two... and it becomes lag again

thinking of returning it
[Nexus 7 General] Kumnaa:
Well in Google's defence they are now aware of the problem and are trying to sort it out. You experience is pretty much why I deal with call centres as a last resort. They never seem to understand a problem unless it's listed on the screen they have in front of them :(
[Nexus 7 General] Cor-master:
Yeah call center employees are just people who filled out an application and got a job. They give you all answers straight out of a corporate written manual on their terminals. Calling them is pointless unless your trying to negotiate a better deal for cable
[Nexus 7 General] angellsl:
Mine runs fine with only 2 gb left