yashsingh1/xdaforums huggingface dataset:
[Nexus 7 Q&A, Help & Troubleshooting] dookie23:
[MENTION=3771488]frankusb[/MENTION]: from what I read, f2fs can automatically trim, and you don't need to schedule fstrim.

I found the following from here: https://plus.google.com/+ChetKener/posts/7No16fUQaFz

What are the advantages of F2FS over stock EXT4 format?

1) F2FS is much faster at writing data than EXT4. Reading data is not some much of a difference but you'll notice a difference in UI fluidity etc because of the higher sdcard writing speeds. (which makes caching data on your sdcard so much easier for you phone hence less lag)

2) F2FS is auto trimmed. One of the problems with EXT4 is it slows down over time because it needs trimming. You can manually trim EXT4 using fstrim but F2FS already does this for you.

3) F2FS was designed specifically for MMC (phone) memory. EXT4 is older and used on spinning hard drives and SSDs alike which is why it is not as "optimized" for your phone.
[Nexus 7 Q&A, Help & Troubleshooting] frankusb:
I read the same. I installed CM12.1 on Friday and gave it the entire weekend to (auto) trim. I gave up on Monday and installed Trimmer and performance has improved.

I tried to keep my usage pattern the same each day. Wake up the tablet, give it a few minutes (wifi is off when sleeping) and then use Chrome/Gmail/Feedly. I only have one data point of acceptable usage and it was after installing Trimmer.
[Nexus 7 Q&A, Help & Troubleshooting] Subhanzg:
I experienced slight performance issue in my old nexus 7 after lollipop but it fixed after 5.1
[Nexus 7 Q&A, Help & Troubleshooting] agaige:
SlimLP performance?

How have SlimLP builds been for the N7? Not worth it? With Slim reorg'ing I also cannot find any recent builds of SlimLP to try.

I've had SlimKat all-f2fs with m-kernel a69 on my N7 (grouper) and been happy at how it's keep this device relevant with the performance and battery life.

Would love to hear if anyone found the upgrade worth it.
[Nexus 7 Q&A, Help & Troubleshooting] pavancs:
Performance increased after installing 5.1
[Nexus 7 Q&A, Help & Troubleshooting] princeasi:
Performance is pretty decent as long as you don't have many ram hungry apps installed. If so, it'll be a painstaking to operate!
[Nexus 7 Q&A, Help & Troubleshooting] frankusb:
Today I found that both /data and /cache failed fsck.f2fs causing an assert. Both file systems were unrepairable.

fsck.f2fs /dev/block/mmcblk0p4

Info: sector size = 512

Info: total sectors = 907264 (in 512bytes)

[fsck_chk_data_blk: 613] block addr [0x3]

Assertion failed!

[fsck_chk_data_blk: 613] blk_addr >= SM_I(sbi)->main_blkaddr

So I used TWRP to backup the data partition and converted both /data and /cache back to ext4.
[Nexus 7 Q&A, Help & Troubleshooting] IamAlexD:
Performance is better on android 5.1.1 and now unofficial android 6.0 is also available for Nexus 7 2012
[Nexus 7 Q&A, Help & Troubleshooting] calyxim:
My solution was to install Jelly Bean but it is missing some features like immersive mode which hinders the multimedia experience quite a bit.

Next stop is to try Marshmallow which is highly praised but I doubt those who praised MM have used JB recently.

Once you go Lolly you start thinking slow is the norm.

Anyway worst case I'll just revert back to CM 10.2.1 which is yet to be beaten.
[Nexus 7 Q&A, Help & Troubleshooting] FirePsych:
I've been using CM 12.1 and it's been very good.

Marshmallow started freezing after a day or so.
[Nexus 7 Q&A, Help & Troubleshooting] oscar_wong67:
F2FS/Optipop

I'm running Optipop (should be discontinued now, as the dev joined the Twisted team), on 5.1.1 with F2FS, so it's pretty decent.
[Nexus 7 Q&A, Help & Troubleshooting] topcorner:
Mine has gone noticeably slower last week since I used up more of the storage space ( I think I had about 2GB left). I remember this happening also pre-Lollipop. But having said that, I think general Lollipop performance is decent if you don't use up all the majority of space (from what I have found.)
[Nexus 7 Q&A, Help & Troubleshooting] princeasi:
It appears I have discovered something that may improve the performance of lollipop. Recently I've went into "Account" ---> "Google" and switched off slides and sound search form syncing. I did this right at the time when my nexus was at crawling speed performance while transitioning from one screen to another. As soon as I disabled those to feats, my nexus my nexus was noticeably performing better right away, Something worth for someone else give a try. My nexus is unrooted stock.
[Nexus 7 Q&A, Help & Troubleshooting] nex86:
uhm is there a stock LMY47V with f2fs support?
[Nexus 7 Q&A, Help & Troubleshooting] wombat3:
Not stock, but CM got f2fs support on data and cache.
[Nexus 7 Q&A, Help & Troubleshooting] albertogdr:
Guys i'm thinking to move to 5.1.1 with my 4.4.4 Nexus 7 2012 32G 3G, now is going to be impossible to use it because google apps keep crashing.

Any suggestions? :D
[Nexus 7 Q&A, Help & Troubleshooting] Uninen:
I've hard trouble charging the device the second i upgraded to the factory image of 5.0, takes forever, had at least one boot/crash without doing anything and AnTuTU score only improved about 1000 poinst from 17600 to 18 thousand something, not really impressed with this, lost bunch of stuff on the upgrade too... which was to be expected and i was ready to pay the price, its just that for this price it seems, i got me a LEMON. I hope they come up with some kind of a fix for this, to at least sort out the worst bugs. Sooner the better. Also, there is this issue of programs just appearing to "recent programs list", even if you (i) have 100% sure closed them before and not started them since.
[Nexus 7 Q&A, Help & Troubleshooting] rbeavers:
Did clean install everything smooth as butter In till I logged into Twitter! Screen froze, ui not responding message, uninstalled twitter, still lag and studering.......

Doing another's clean install!
[Nexus 7 Q&A, Help & Troubleshooting] PunishedSnake:
Smoother than KitKat but still needs f2fs formatting

Also cast screen option I'm settings, display doesn't see my chromecast
[Nexus 7 Q&A, Help & Troubleshooting] Stresa:
I manually wiped and flashed the factory image to my 2012 N7 and I'd have to say that it has never been smoother. No lag issues at all up to this point. The big test will come when I get most of the storage filled up and run it for a few weeks. So far I'm very impressed!
[Nexus 7 Q&A, Help & Troubleshooting] isketerol:
I did an upgrade by flashing boot and system. I'm a little concerned that the performance I have seen so far isn't as good as with KitKat 4.4.4. It seems to be laggy in a number of areas. I'm hoping this will resolve itself as some of the updates for core apps get done but I realize that this may be wishful thinking.

IskiE
[Nexus 7 Q&A, Help & Troubleshooting] kannextic:
I used up 25 of the 27 available GB and my N7 is unbearably laggy. I'm trying to back up my apps and do a clean install, but this is a slow process and based on all these comments, I don't think it'll gonna help :(

I hate it that the SD partition gets wiped when you do a factory reset on the Nexus devices.
[Nexus 7 Q&A, Help & Troubleshooting] AJ06:
I suspect the choppiness is due in part to the terrible kernel & nand storage.
[Nexus 7 Q&A, Help & Troubleshooting] YellowMango:
Is it just me or there are no clear visual cues when an app is touched? I thought I haven't even touch that app yet, then it pop up, with dropped frames
[Nexus 7 Q&A, Help & Troubleshooting] Mockingbird:
For me Lollipop is ok. The only issues I have is atorrent doesn't download with more than 2mb/s where as with cm11 it would go to 5-6mb/s. Also the battery is a lil bit worse from 4hr screen on time with my use , I'm down to 3.5hr . I guess it's because of the poor stock kernel. Will wait for MKernel to update. Also no random reboots :)
[Nexus 7 Q&A, Help & Troubleshooting] bhargav143:
Performance is acceptable.. Antutu scores nearing about 20k mark.... Some apps run smoother some take much more time to start... All credits to NAND dependency of Lollipop...

Anyways... On the other hand....

I felt Google did not solve anything they have just hidden the miscellaneous battery issue....just to release the lollipop as scheduled..

I get much lesser SOT (3-4 hours) compared to 5+ hours on KK... and while using with WiFi it decays exponentially... While Wi-Fi not being used... it acts normal....

Another thing, WiFi was on for 12 hours almost and accounts to only 1% battery? I don't agree.... Google is faking this time I feel....

I hope the above is not true......

Is there anyone who agrees and experience the same?

-via Nexus 7
[Nexus 7 Q&A, Help & Troubleshooting] pzboyz:
I have just changed to the Google Now Launcher, and my initial impressions are that it is much better.
[Nexus 7 Q&A, Help & Troubleshooting] vo4LG:
Performance for me on official Lollipop on 32GB model was so bad that I've gone back to CM11 KK. I found it unbearably and unusably bad.

I think the performance of the unofficial release was much better than the official release, actually (based on my totally unscientific fiddling with each).

Edit: ahhh, CM11 with F2FS is soooo much faster than official Lollipop.
[Nexus 7 Q&A, Help & Troubleshooting] Keydogg1:
Well I can see a lot of negative comments in here which is a shame, but I suppose with a device that is two years old there are going to be some issues.

My experience I'm glad to say has been different so far. I'm very happy with my Nexus 7 16gb (WiFi) since the lollipop upgrade, everything is smoother and less choppy than KK, plus the added functionality is awesome.

Admittedly it's not as snappy as my Nexus 5 by a long chalk, but this is a 2012 tablet with just 1GB of RAM so we can't expect miracles!

FWIW I disabled Google Now straight away because I don't use it.

All good over here.
[Nexus 7 Q&A, Help & Troubleshooting] vo4LG:
You used the official images? I am wondering whether it is different expectations or different actual performance, because back on KK mine runs great (with nothing on it, but LP didn't have anything on it either).
[Nexus 7 Q&A, Help & Troubleshooting] Keydogg1:
Yes I've always had stock, unrooted.

I totally agree that everyone's expectations are different, and also different devices with different are going to perform differently, I just feel that some people are expecting L to suddenly change their dated device into something that competes with today's tech. I was expecting nothing more than a few more features, extra prettiness and a little smoother transitions and I'm happy to say all of the above have been ticked :D
[Nexus 7 Q&A, Help & Troubleshooting] garryboy:
Couldn't have put it better. Find my nexus is now a pleasure to use again and I'm not reaching for my nexus 5 as I did before when the lag got so frustrating.
[Nexus 7 Q&A, Help & Troubleshooting] vo4LG:
I think I'm going to have to try installing the stock LP images again, then, because I was getting delays of 5-10 seconds just sweeping between screen in the app drawer, 15+ seconds trying to open a settings page, etc. That was with a fresh install. It was basically unusable, but sounds like it is nothing like that for you.

You using a 8GB, 16GB, or 32GB? (I'm on a 32GB)
[Nexus 7 Q&A, Help & Troubleshooting] garryboy:
16gb with about 6gb free space
[Nexus 7 Q&A, Help & Troubleshooting] TonyHoyle:
Yeah I'm seeing delays like that too, on an 8GB. I don't expect it to be as snappy as my N5 but I don't expect to be staring at blank screen for the much of the time...
[Nexus 7 Q&A, Help & Troubleshooting] Reecegibbs:
I was wondering on how lollypop will perform on my nexus 7 (I have just returned to xda after some time so I haven't been able to catch up lol) im using kitkat but rooted with the pa rom and motley kernel an dim using a theme on it that strangely looks like the lollypop with all the transitions and extras. it runs smooth but now lollypop seems to almost what I want my tablet to be im interested in its performance and if my kernel would work so I could overclock it to a safe 1.5ghz?
[Nexus 7 Q&A, Help & Troubleshooting] iBolski:
I will say the initial performance after switching was bad, but I also think a lot of that has to do with it recompiling apps. When I did a complete wipe install, the initial start up again was slow but it was also restoring all my apps from the cloud, so that took a few hours to download the apps, download additional files (if any) for the apps, as well as some settings.

When I started restoring apps from TiBu, again it was slow, but the main reason is ART. When an application is first installed, it has to be recompiled. This is different from Dalvik where it would recompile the app upon first launch. ART has it recompile the app upon installation. So, the app should launch a lot quicker under ART as opposed to Dalvik.

Overall, it appears to be working pretty darn well. A few apps (such as Madden Mobile) seem to crash frequently after playing for a while. I'm thinking that's an issue with the app and not Lollipop. Hopefully, EA will address it soon.

Otherwise, pretty happy with Lollipop.
[Nexus 7 Q&A, Help & Troubleshooting] cadboncopyvw:
I've got fairly poor performance as well. Definitely worse than the stock KK rom on a stock unrooted (same as KK was) rom.

What I've found is that the first time you launch an app after a reboot it is slow - how slow depends on the app - but once loaded once it is swift reloading until I load Chrome or a few other apps. This has happened across multiple reboot tests across more than one day. It's almost like Lollipop is slower but holds more of a non running app in memory so switching back and forward is faster until the app gets removed from memory out due to another large app running or forcibly removed by a reboot.

The Facebook app is particularly slow at loading the first time after a reboot as is Twitter.

Chrome seems to trigger more apps being removed from memory than anything else so I guess it's just got a bit beyond our aging devices which seems mad given that it is just a web browser.

I've reflashed to try resolving this (both flashes were using the stock factory image, unrooted, etc. and clean installs). I've checked that encryption isn't enabled etc.

I've also monitored the CPU using OS Monitor and nothing seems to be running continuously using CPU - battery life seems normal as well so that would seem to rule out a rogue app.

This weekend I plan to not restore any apps from my google account and see if it runs any better then put apps back one by one just in case it is an app causing the issue.

Failing that I reckon I'll go back to JellyBean as I can no longer be bothered faffing with root and tweaking settings, I'd rather get on with using the device.

Oh, and I'm slightly miffed that the simple press and hold power to get the menu switch to silent mode has gone - that was more convenient for my usage than the new way of doing things.
[Nexus 7 Q&A, Help & Troubleshooting] iBolski:
Yeah, that is something I don't like. Instead, you can "mute" the notifications based. It's not the greatest way of doing it, but click on either the volume up or volume down button.

At that point, a panel will show up and from there you have a few choices:

None - no interruptions at all.

Priority - you can set up what interruptions are considered priority.

All - Allow all interruptions.

Interruptions is notifications and phone calls (for phones). You can set the none and priority to be indefinite (stay that way forever) or set up a time frame to go back to regular notifications.

But, that doesn't help if you also want to mute app sounds (such as games, etc).

Not sure what Google was thinking of there so I feel your frustration on that. But, since mine is the WiFi version of the Nexus 7, I don't mind this too much. But, I would hate it on my phone.

Hoping when Cyanogen CM12 comes out, they add in some extra menu items.
[Nexus 7 Q&A, Help & Troubleshooting] cadboncopyvw:
Yeah. I worked out how to do it - I just don't like it
[Nexus 7 Q&A, Help & Troubleshooting] Overmann:
I've worked out why there is such slow network performance on the 5.0 build.

See, I was trying to irssi to my server using its hostname. It would not take the hostname locally, which I found odd. I use a local bind9 server on my LAN as a DNS relay, because it is faster and more reliable than choosing one company's DNS or another, and it lets me DNS hostnames and such.

So, I go into terminal, install busybox, and start nslookuping random sites. What do I find?

DNS Server: 8.8.4.4

Yeah, these devices are going straight for the Google Public DNS instead of the DNS you specify. And it gets better. You can't DHCP the tablet without also using the Google DNS by default.

So "there's your problem" with slow connection initiation on Android 5. Google's DNS is overloaded. When you nslookup, you will notice it takes a while to get a response on that server. On my local bind9 server, it spits out a DNS query almost instantly after pressing Enter. That makes a difference.
[Nexus 7 Q&A, Help & Troubleshooting] Keydogg1:
I'm running the 16gb, although I heard the 32gb versions are actually a little quicker due to faster memory, not sure if anyone is seeing a difference with the 32gb!
[Nexus 7 Q&A, Help & Troubleshooting] nlaplante:
Yeah smooth right after install. But as soon as you start adding apps and sining into them, the thing starts to lag, freeze, feel sluggish and take lots of time to respond to touch events. I noticed that as soon as network activity is involved, the thing refuses to cooperate. So, it's the same behavior as with 4.2, 4.3 and 4.4.

So no matter which version of Android you put on this, it feels the same. Hardware problem I guess. Maybe storage unit has degraded too much since the beginning. I don't know.
[Nexus 7 Q&A, Help & Troubleshooting] Spyvie:
I logged in today wondering if I should wipe my 32GB CM11 N7, then I remembered I use the power menu screen shot function every day, and read a USB stick once in a while.

Still, cool new menus in bright new colors almost had me.
[Nexus 7 Q&A, Help & Troubleshooting] tuffdadsf:
Uninstalled Google Now Launcher - Faster Lollipop!

I have also been dealing with the crappy lag and blackouts on the Nexus 7 with Lollipop and then it occurred to me that maybe the reason Google Now Launcher is not installed automatically with the update is that it has performance issues that Google was aware of. Sure enough, I uninstalled Google Now Launcher and now the tablet is running smooth and fast (only an hour in for testing so far).

I guess I'll see how it goes for the weekend and see if that was the case. Worth trying if you are also having the slowness and such.

** I failed to mention I have the Nexus 7 8GB model
[Nexus 7 Q&A, Help & Troubleshooting] [1]:
didn't work for me...tried both "launcher" and nova. both are equally slow.

going back to slimkat. i may be back when this mess is straightened out.
[Nexus 7 Q&A, Help & Troubleshooting] bagl0312:
Same thing for me, with lollipop it was completely unusable (n7 32gb version).

I decided try slimkat + f2fs and my old friend got a new life ?

Inviato dal mio Nexus 4 utilizzando Tapatalk
[Nexus 7 Q&A, Help & Troubleshooting] salutcemoi:
I have the 32 GB version and Lollipop is an improvement

I wipe the device before flashing the factory image

Not sure if wiping the device clean makes a difference
[Nexus 7 Q&A, Help & Troubleshooting] mrm1:
I flashed without wipe using nexus root kit as really could not be bothered seeing up from scratch again and wanted to see it it would work. A long first boot as normal with lollipop. Was really slow and unusable afterwards. Powered down and restarted and now working great. All my apps and settings seem to be intact. Seems a little quicker than before but that could just be a placebo effect.
[Nexus 7 Q&A, Help & Troubleshooting] xateeq:
First impression is good. I hope it stays the same after some time.

Sent from my HTC One
[Nexus 7 Q&A, Help & Troubleshooting] iBolski:
Did you either freeze it or remove it altogether? Just switching to Nova won't help. You need to remove or disable the default home Launcher that comes with it.

I froze it and things have been running pretty smoothly for me. Probably even better than when I had the default launcher enabled, even though I wasn't using it.

I don't know what it is with that stupid GoogleNow launcher, but it's caused nothing but headaches for me when it was first released. It never behaved well on my Nexus 7, so that's why I've stuck with Nova. Best money I ever spent (well, that was also on TiBu, but you know what I mean).
[Nexus 7 Q&A, Help & Troubleshooting] [1]:
complete uninstall.
[Nexus 7 Q&A, Help & Troubleshooting] iBolski:
Hmm. Strange. I guess I'll wait and see if I start to see performance degradation after freezing it. So far (knock on wood), it's been fine.
[Nexus 7 Q&A, Help & Troubleshooting] tronmech:
Oh, don't get me started. Started with a dirty flash of the system image. Don't do that if you're not coming from stock kk. Just don't.

So, I tried again by wiping data too. Somehow it wound up losing half my internal storage. Retried using the flash-all batch file. That got me going, but the lag has been painful at times.

Problems so far:

1) App restore through Google Play apparently paused when the screen blanked. I'm guessing that the "keep WiFi on during sleep" settings glitched. Reset it and I think it works now.

2) Keyboard doesn't come up fast enough, or start responding quickly enough, to allow you to unlock the device. Not fun when you install a work app and it comes with an 8 character alphanumeric password requirement. Had to hard reboot so I COULD unlock it.

3) A lot more lag than I expected. I wonder if it's because of I'll behaved apps, but it still happens.

On the good side, it looks like I'm getting 4 hours of screen on time so far today.
[Nexus 7 Q&A, Help & Troubleshooting] [1]:
just got slimkat f2fs reinstalled... much better!

i'll try lollipop again when we get an f2fs rom...
[Nexus 7 Q&A, Help & Troubleshooting] Overmann:
Also, I verified the difference by setting a Static IP and DNS for my wifi connection. That made a difference.
[Nexus 7 Q&A, Help & Troubleshooting] vo4LG:
The Power+Volume Down (volume up? can never remember) will still take a screenshot. Also, unless you're using NTFS or exFAT on your external USB stick then it should still work even with official, I believe. OTG support is standard in the N7, right?
[Nexus 7 Q&A, Help & Troubleshooting] GtrCraft:
My N7 is perfect after flashing LRX21P image, all my apps (200) are running far better than on kitkat. A lot of people should try a factory reset instead of dirty flash :p
[Nexus 7 Q&A, Help & Troubleshooting] hasenbein1966:
Had CM11 With Franco Kernel before; was really smooth.

Now, with 5.0, very laggy!

Starting / switching apps or returning to the home screen is very slow. Also jerky scrolling in some apps, for instance Chrome.

Definitely NOT impressed!
[Nexus 7 Q&A, Help & Troubleshooting] Monfro:
I am really disappointed with Lollipop 5.0 official release.

It is clearly in beta stage, not ready for daily use.

Speaking about Nexus 9 and 6 a lot of reviewers pointed out that sometimes these devices gets laggy: seems clear that Lollipop is to blame.

Google was not ready to release it, but they had to...

Maybe Lollipop is well optimized for Snapdragon 800/801/805 (and maybe also 400/600, since Snapdragon chipset is used by Google since Nexus 4), but for sure it is not working well on Tegra 3.

To make some comparisons I am now running on my Nexus 7 stock 4.3 ROM: it really flies also with stock kernel, and battery life is good.

KitKat release lost both in performance and battery fields compared to 4.3, but is still working well.

Lollipop is unusable.

For sure Google will work hard on Lollipop, releasing 5.1, 5.2..

Until then I suggest to stick with 4.4.4 f2fs or with 4.3 (probably the best Android version for this tablet).
[Nexus 7 Q&A, Help & Troubleshooting] gogol:
I am with you!

Lollipop is really laggy. I installed from scratch, image, not OTA.

Installed some apps one by one.

And man ... it's freakingly laggy here and there :(