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I know this is going to sound very much like a first world problem, but this phone is frustratingly ****. It is easily the buggiest, slowest, most laggy phone I have ever had.
I have tried just about all the LG based ROMS, only to find that each one, although not buggy, are all laggy. The lag is so bad that it gives my old S2 on Gingerbread a run for its money. At least with Samsung phones, you could get rid of the lag by using a AOSP ROM and it would still be functional.
To solve the frustrating lag issue, I have installed a CM based ROM. At first I was delighted. The lag was gone. The phone was now comparable to my super fast Nexus 5. But after a few hours, I noticed the same bugs that every other CM based ROM user has. Today, I had to restart the phone six times FFS! It is a little more stable on 777 Kernel, but the same issues still persist.
Has anyone achieved bliss with this phone? Is there any ROMS, AOSP or LG based, that are fast, (Nexus 5 fast), and bug free?
Don't get me wrong, I love devs and the work they do. Without them, my old Galaxy phones, (S1, S2, S3, S4), would have been poo. My Nexus 5 would have been boring. (Stock android is meh). I just don't understand why this phone seems to have so many issues. Help me understand why it is so hard to develop a fast and reliable ROM for this phone. I know it isn't from a lack of trying. There is heaps of support and devs working on various ROMS in the G3 threads already and all of them are very talented.
Is it hardware based lag or is there something else inherently wrong with the phone?
Thanks for reading and offering any solutions. I don't want to list the ROMS I have tried, as it will seem like I am an ungrateful twat to those devs that worked so hard. Suffice to say, I have tried all the popular CM/AOSP and LG based ROMS.
Stock 5.0 V20H fine for me no lag [emoji3]
I switched to note 4 whilst g3 was good I had a better experience with my note 3. So upgraded
-= Note 4 & Gear VR =-
hashcheck said:
I switched to note 4 whilst g3 was good I had a better experience with my note 3. So upgraded
-= Note 4 & Gear VR =-
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I don't want to switch so soon. There has to be a solution. I love the screen and size of this phone. The only other phone I would consider is the droid turbo, but it's so bloody expensive!
DoobyDroid said:
Stock 5.0 V20H fine for me no lag [emoji3]
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Compared to what? Which other android phone have you used? In isolation, this phone is barely acceptable. Then, after you use a nexus, HTC or Sony phone, this phone is comparably slow. Almost unusable.
I can't bring myself to try stock again until someone who has other phones to base their claims on can confirm it is lag free.
cubic25 said:
Compared to what? Which other android phone have you used? In isolation, this phone is barely acceptable. Then, after you use a nexus, HTC or Sony phone, this phone is comparably slow. Almost unusable.
I can't bring myself to try stock again until someone who has other phones to base their claims on can confirm it is lag free.
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Have you tried the usual tricks?
1. Swap out the stock launcher for something like Nova or Apex
2. Switch your keyboard to a 3rd party keyboard
While it does suffer from the random stutter, my phone is generally very zippy and does not lag.
Done all that. On stock based ROMS, stutter and lag is unbearable. My wife, nexus 5 user, even commented on how bad it is. I'm actually embarrassed to use the phone in front of people. I know it isn't a hardware issue, because AOSP ROMS are lag free, but not bug free.
Yeah, the phone is nowhere near as quick as a Nexus. The notification bar is also **** compared to stock Lollipop. There are a few tricks I use to improve performance on a stock rom:
1) Turn off throttling/thermal daemon via the service menu.
2) I use setCPU to set the phone to use the "performance" scheduler whenever the screen is on, locking it at 2.5Ghz.
Still isn't perfect, but it helps substantially. Obviously this is in addition to changing the launcher.
It's just one of those things. As you say, CM12 just isn't stable and worryingly seems to be going backwards, getting less and less stable with each passing nightly. The camera is also completely crap on AOSP roms. Nexus devices are great but the N5 is old and the N6 is too big and expensive. The S5 lags too, and while Note 4 is supposed to be good, but I simply won't believe that Touchwiz lag is gone without seeing it with my own eyes. Even if it has gone, Touchwiz remains the ugliest skin I've ever seen. Sony phones are nice, but they aren't packaged anywhere near as tightly as the G3, which is it's biggest strength: 22mm shorter than an iPhone 6+, with the same size screen. That's impressive. HTC's are just ridiculously large for a given screen size. The 1+1 is old now, and doesn't support all LTE bands used in the UK.
There is no perfect phone. Whichever you choose, there are compromises to be made. However IMHO the G3 strikes the best compromise available today, at least once running the latest Lollipop build and with the tweaks I mentioned above applied.
Had most 2014 flagships and G3 is deff fav so far, didnt have KK as updated to LP out the box had little lag after ota but common just needed a factory reset and all good since
Just a tip you can use on any android phone, go to settings, developer options, and set all the animations to 0.5x. This drastically reduces the time the animations take, and it gives a very snappy experience. It makes a LOT of difference, trust me.
No lag whatsoever here. Im running Chupachups newest rom with rin kernel. I've previously owned htc one, lg g2, xperia z1 and this phone definitely outperforms them all.
Ive owned the Xperia Z1, HTC One M7, and tbh id rate this better than both, i would like the battery life to be better my Z1 was amazing for that buh im custom stock rom and i dont get lag, everything is as it should be.
cubic25 said:
I know this is going to sound very much like a first world problem, but this phone is frustratingly ****. It is easily the buggiest, slowest, most laggy phone I have ever had.
...
Has anyone achieved bliss with this phone? Is there any ROMS, AOSP or LG based, that are fast, (Nexus 5 fast), and bug free?
...
Is it hardware based lag or is there something else inherently wrong with the phone?
...
.
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Click to collapse
Because LL is still unstable and buggy? And so is any rom based on it?..
Stock firmware sucks because of LG's software - it's very badly written. Almost as bad as touchwiz is. (I used SGS3, trust me on that one...)
AOSP/CM based firmwares are better, but they still suffer due do LL newness. Wait till android 5.1, things may become better.
There is also a hardware issue: unbelievably bad heat management. They used 8974ac, but had not made any cooling system. No radiators, no heat spread throughout the case, and it's facing LCD panel - which is a very bad radiator. GG WP, throttling kick in, phone starts to lag, etc etc etc.
I think there may be problem with your unit... Try to send it back to get a replacement or have it serviced.
Sent from my LG-D855 using XDA Free mobile app
I agree that most of the stock LG-G3 roms, Lollipop/Kitkat, if not rooted and without any mods, LAG is unavoidable. The case is, some people can't root their phones and most of them will try searching why G3 stock rom is lagging... if I'm one of them and I happen to see this post, I would feel bad and feel stupid at the same time why I spend money buying a crappy phone.
Well anyways, try Crash Rom v2.0. It is a stock based ROM like chupachups. The animation is not as fluid as CM but I won't say that it's lagging. Compared to CM, I have not yet encountered any bugs and mostly the camera is better. If you're interested you can also downgrade the resolution to 1080p, this will enhance your g3, 3d and 2d graphics performance.
Hi im all so on lollipop 5.0 updated out of the box and its all good maybe some lag not much to notice. Still no root method yet for stock lollipop 5.0 and i dont want to downgrade to kk so il have patience and wait for new root method for me g3
Wow, I went from the nexus 5, to the htc m8, to the g3 all in year. My advice, play with this one to get the phone lag gone. This by far is the best. Like a previous person said, turn off animations and change the launcher.
mab71 said:
I think there may be problem with your unit... Try to send it back to get a replacement or have it serviced.
Sent from my LG-D855 using XDA Free mobile app
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Can't be an issue with the phone, as it is lag free with CM based ROMS.
marfioso said:
I agree that most of the stock LG-G3 roms, Lollipop/Kitkat, if not rooted and without any mods, LAG is unavoidable. The case is, some people can't root their phones and most of them will try searching why G3 stock rom is lagging... if I'm one of them and I happen to see this post, I would feel bad and feel stupid at the same time why I spend money buying a crappy phone.
Well anyways, try Crash Rom v2.0. It is a stock based ROM like chupachups. The animation is not as fluid as CM but I won't say that it's lagging. Compared to CM, I have not yet encountered any bugs and mostly the camera is better. If you're interested you can also downgrade the resolution to 1080p, this will enhance your g3, 3d and 2d graphics performance.
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I'll give crash a go this afternoon and report back. Hopefully 5.1 ROMS fix the issue too.
dspcap said:
Wow, I went from the nexus 5, to the htc m8, to the g3 all in year. My advice, play with this one to get the phone lag gone. This by far is the best. Like a previous person said, turn off animations and change the launcher.
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Already done all that. Animations are turned off, launcher animations are set to lightning fast, CPU throttling is turned off. I've tried all the tricks in the book. Fact is, LG based software is crap, just like Samsung.
So far today, the lock-screen has only frozen on me four times, which is good.
I'm not sure if I'd rather put up with a laggy phone or a buggy phone.
My phone is currently on V20h. Apart from the occasional Home launcher crash, I've not had any lag that I notice of. The last time there was any lag was on V10i. My phone is rooted but is not running any mods.
Prior to this, I've had the Note 3 and Xperia S. Compared to the G3, I would say that the smoothness is at the very least, on par with the Note 3 running on stock.
I've seen people complaining about the G3 being laggy too. Is your phone by any chance the 2 GB RAM version?
My phone is the 2gb version, but I always have at least close to 300mb free. Sometimes I have over 1gb free. Not that it should matter though, as I have read on numerous places that the 3gb version lags too, and that both phones are very close on performance. The extra 1gb of RAM is negligible.
Just flashing Crash ROM now. I think I'm going to regret it though, as I much prefer the look of AOSP anyway.
Ah crap. Just as I flash the ROM, I read that the dev is stopping support for our device. Based on the comments, it looks like a promising ROM.
So, Samsung finally released Lollipop for just about every Note 4 variant now but, after reading a lot of people suffering from huge battery drain, overheating and random crashes, I'm just wondering if I should bother updating to lollypop myself.
I'm still on stock 4.4.4 (with a fair amount of mods) and my phone runs exactly how I want it to. The only ever problem I have is sometimes contacts crashes, but it's not even done that for about a week.
What are the advantages (if any) of upgrading to lollipop?
Let's see if you can convince me to part with my very stable and perfectly functional modded 4.4.4.
Chillerhippie said:
So, Samsung finally released Lollipop for just about every Note 4 variant now but, after reading a lot of people suffering from huge battery drain, overheating and random crashes, I'm just wondering if I should bother updating to lollypop myself.
I'm still on stock 4.4.4 (with a fair amount of mods) and my phone runs exactly how I want it to. The only ever problem I have is sometimes contacts crashes, but it's not even done that for about a week.
What are the advantages (if any) of upgrading to lollipop?
Let's see if you can convince me to part with my very stable and perfectly functional modded 4.4.4.
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Click to collapse
BOC5 works perfectly fine here and is a lot smoother than any KitKat version that I used prior. If you play a lot of games then chances are you might run into the GPU bug, but other than that I see no problems in going with the newest Android version available. :good:
I got N910C. No root.
These are some facts about KK & LP according to my own experience.
KitKat 4.4.4:
Had volume spike answering bug (mentioned somewhere on XDA),
Had read only SD card problem (due to Android restrictions),
Lollipop 5.0.1:
Solved both above mentioned issues of KK,
Faster and smoother than KK,
No crashes, freezes, hickups, overheating - rock stable,
Better RAM management,
Better or equal battery consumption,
Material design (I love it, somebody else may not)
1-2 second answering ''hello hello'' bug (caller can't hear me 1-2 sec. after my answer). I don't know is anybody else has this bug,
GPU throttling bug (when phone reaches about 50 C some games stutter and benchmarks like Antutu show low results due to lower GPU frequencies)
Everything is perfect except this. This should be fixed ASAP in next update.
Be aware of this and consider eventually upgrade to Lollipop
Just in case: lots of shortcut apps (e.g. pulling down the notification bar!) don't work on Samsung's iteration of Lollipop anymore. That's still one of the biggest issues at least for me!
I have updated my UK ee phone to the German BOC3 and I have to say I'm very impressed with it. I have done a dirty flash and I haven't encountered a single issue. My battery life seems better, the system settings feel cleaner and the general visual tweaks and nice. Looking forwards to the btu
Sent from my SM-N910F using XDA Free mobile app
Experience with 5.01 Lollipop Update, i have had no issues with Lollipop
Lp fixed the Bluetooth stuttering bug for playing music in my car via Bluetooth.
The notifications are great and usually appropriate...
No battery crash or menu problems on Bell.
No hello hello bug I have noticed on Bell carrier
I have posted and used numerous Lp5-5.1 roms with different modifications. After using them for a few months, I have decided to try Kitkat just to refresh my memory. What a pleasant surprise I got: My Z1 turned in a different device, which is faster, lighter, more fluid and virtually bugless. No overheating issues, which exist on 100% of lollipop roms. No memory leaks, no screen problems, no lagging, no freezing, no limited features...
Note that Lollipop has been around for over 6 month and there is still not one stable version. And there won't be one, as each bug fix introduces a new one. I can't blame developers: LP is simply bad in design, it can't be fixed. Art is a layer that burdens the device and is a step backwards. It burdens CPUs, hence you always have overheating and no tinkering with voltage will help. After using a web browser for 10 min (just browsing, no video), cpu temp goes up over 65 and even fixed thermanager, tweaked to not kick in until 60-65, starts to work resulting in flickering. Using camcoder for about 5 minutes results in display, the app and literally the phone shutting down, as CPU temp goes to 85-90. To fix overheating, you have to get rid of art. Art also burdens ram, while it was supposed to do the opposite. What else do you need: your phone overheats, lags, freezes, crashes, apps f/c, ram is under pressure, battery won't properly charge and none of it can be fixed in over 6 months.
Bye bye, LP, for good.
optimumpro said:
I have posted and used numerous Lp5-5.1 roms with different modifications. After using them for a few months, I have decided to try Kitkat just to refresh my memory. What a pleasant surprise I got: My Z1 turned in a different device, which is faster, lighter, more fluid and virtually bugless. No overheating issues, which exist on 100% of lollipop roms. No memory leaks, no screen problems, no lagging, no freezing, no limited features...
Note that Lollipop has been around for over 6 month and there is still not one stable version. And there won't be one, as each bug fix introduces a new one. I can't blame developers: LP is simply bad in design, it can't be fixed. Art is a layer that burdens the device and is a step backwards. It burdens CPUs, hence you always have overheating and no tickering with voltage will help. After using a web browser for 10 min (just browsing, no video), cpu temp goes up over 65 and even fixed thermanager, tweaked to not kick in until 60-65, starts to work resulting in flickering. Camcoder results in display, the app and literally the phone shutting down, as CPU temp goes to 85-90. To fix overheating, you have to get rid of art. Art also burdens ram, while it was supposed to do the opposite. What else do you need: your phone overheats, lags, freezes, crashes, apps f/c, ram is under pressure, battery won't properly charge and none of it can be fixed in over 6 months.
Bye bye, LP, for good.
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Click to collapse
Let's hope, that these bugs also exist on nexus devices and are not device specific, so that google fixes them in Android M.
Could you tell us which kitkat bulid you are actually using?
Regards,
mischa_martin
Slimkat.
http://forum.xda-developers.com/xperia-z1/development/rom-slimkat-final-edition-built-source-t3045435
I keep reading about these issues plaguing a lot of devices, but I simply can't share the same experiences. And believe me, I'm a power user... I'd notice.
I listen to music while downloading zips, while browsing the forums and my device stays at a comfortable temperature. And it's summer here... 30 Celsius every day at least.
Then, the touch screen freezes is something I know nothing about. Only had it once, on build 5.4.4. of RR.
The memory leak and screen light flickering is something I encounter only on stock...
I don't know what it is about my device, but I'm nothing but thrilled with lollipop.
Sent from my Xperia Z1 using XDA Free mobile app
zgomot said:
I keep reading about these issues plaguing a lot of devices, but I simply can't share the same experiences. And believe me, I'm a power user... I'd notice.
I listen to music while downloading zips, while browsing the forums and my device status at a comfortable temperature. And it's summer here... 30 Celsius every day at least.
Then, the touch screen freezes is something I know nothing about. Only had it once, on build 5.4.4. of RR.
The memory leak and screen light flickering is something I encounter only on stock...
I don't know what it is about my device, but I'm nothing but thrilled with lollipop.
Sent from my Xperia Z1 using XDA Free mobile app
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Click to collapse
+1
The stock lollipop roms have driven me to root and install a custom 4.4.4 rom after sticking with stock for the first 18 months or so. Rubbish battery life, heat, redraws in action launcher. Hopefully a good lollipop will appear, and I might flash that through recovery once it's proven. Or maybe with 5.1. But returning to 4.4.4 with customisation is like night and day. Fast, cool, no redraws. Keeping a watch on 5.x
I agree all the custom 5.0.x and 5.1.1 ROMs have countless issues and bugs, heating, poor RAM management but I'd like to appreciate Sony's work with Lollipop. Sony's stock Lollipop is pretty good even for power usage. Though KitKat was definitely one of the better versions of Android. At least our stock Lollipop isn't that bad. As for me I'm going to stick to a rooted stock Lollipop until a stable AOSP ROM comes out, which will take some time, considering KitKat also took ages to fix.
I would like to see BeanStalk with shields up, like Dirty Unicorns and Slimkat :angel: Please! Slimkat is good but Beanstalk has more features.
_s_plus said:
I would like to see BeanStalk with shields up, like Dirty Unicorns and Slimkat :angel: Please! Slimkat is good but Beanstalk has more features.
Click to expand...
Click to collapse
Edit: Thanks for new Slimkat 10 build, I am still hoping for secured Beanstalk, no chance? Best Regards
Sent from my honami using Tapatalk
After upgrading everything was nice and smooth for the first couple days but now I've hit some hard performance and lag issues especially keyboard lag. I experienced these on the developer previews on every preview so I always downgraded but this is kinda ridiculous to experience this on the official release of Nougat. Anyone else having these problems? Any fix? Clearing cache is not a workable fix, it only helps for a small amount of time say 20mins and then it's right back yo lag central. Hugely frustrating as this is my only device.
Worse than MM? I'm honestly disappointed with the performance of the device. Recommended it to my girlfriend when she had to upgrade from her iPhone, and performance is atrocious on MM. It seemed like a memory leak, because rebooting would help for a day or so, then the stuttery laggy mess comes back. It's performace pales next to my Oneplus One . I hoped the Nougat update would help fix those issues?
Ive never had any lag issues on MM or Nougat
Didn't have lag issues on MM(I'd say performance went doing after the 6.0.1 release especially in the battery dept tho.) but Nougat has been atrocious. I don't understand how mkbhd was saying he had no problems with developer preview or 7.0 because its apparent after a day of use. I've rebooted my phone like 5 times so far tonight clearing my cache each time and sure enough an hour or more later it's right back to lag town. I will say it's gotten better since dev preview 5 but it's still too bad for daily driver. Who the actual **** is working on the Android team at Google? This has been reported and known since preview 1 and yet it seems to never be addressed
Lately Google's quality of work seems to be: ¯\_(?)_/¯
Yeah, I'm seeing bad intermittent lag and stutter on 7. I also saw it on 6. 0.1 though. It may just be a hardware issue with the rubbish 810?
Sent from my Nexus 6P using Tapatalk
7.1??
shanxybeast said:
7.1??
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He didn't say seven dot one (7.1), he said seven period space (capital) eye (7. I).
So here's something interesting, after I uninstalled screenwise panel I haven't been experiencing the keyboard and performance lag
No lag here on stock unrooted nougat. Has to be a third party app. Battery life has been a unicorn on nougat I must say. When the phone dirty flashed nougat over marshmallow i had terrible battery life. Lost 25% precent in just two hours! Factory reset cleared that up so o thought. This morning after leaving the house and the charger, phone felt slightly warm on hostler. Checked it and sure enough, down to 80% in 2 hours. Rebooted and problem was gone. I hope i don't have to reboot every day to get good battery life. I believe this is not the same update Google will push to non beta members. Hopefully the "release" version will have these things sorted out.
Sent from my Nexus 6P using XDA-Developers mobile app
The 7.0 pushed to the beta users is the same release version, there aren't two different Roms. Also while uninstalling screenwise panel seems to have cleared up the majority of the lag, there is still Ram Memory problems and slight stuttering
Factory data reset after EVERY MAJOR ANDROID UPDATE. If you haven't, you need to do that. After an update a lot of the time the temp and backup files aren't erased after the update and they can lead to performance issues. Especially on a new device you should not see any lag on the 6P on MM or Nougat.
In fact, I have seen my 6P even smoother and snappier on N over MM.
I never experienced any kind off issues on MM was very happy with the performance. Now that I have taking the Full OTA update to 7 I can tell a big difference in battery life and it's amazing. 7 has been running very smooth and buttery for me. But I've noticed that a lot of people that moved to 7 never factory reset their phone BC of losing data n such and most of them seem to be having a bad experience.
Soon as 7 booted after the update I then went in to stock recovery and factory reset the phone then went through the set up installed all my apps then flashed TWRP 3.0.2.1 then made a backup of r he stock ROM. Then flashed superuserUpdate 2.76 booted the phone and restored all app data via Titanium backup ran for a few days to make sure no issues was going to pop up then made another backup.
Currently I'm 7 all stock with stock kernel and root. The only mod I flashed was the soft key swap.
And during the wipe n stock recovery I wiped the internal storage also..
But hope you get it figured out man BC it's really worth the move..
Sent from my Nexus 6P using Tapatalk
Eric214 said:
Factory data reset after EVERY MAJOR ANDROID UPDATE. If you haven't, you need to do that. After an update a lot of the time the temp and backup files aren't erased after the update and they can lead to performance issues. Especially on a new device you should not see any lag on the 6P on MM or Nougat.
In fact, I have seen my 6P even smoother and snappier on N over MM.
Click to expand...
Click to collapse
why not just download a free app like cc cleaner that can get rid of files like those?
My 6P started acting weird the last 4 days. Apps will freeze then the pop up says app not responding close it or wait. Also the screen will not turn on when I hit the power button or use the fingerprint reader. I have to hit it many times before it comes on. I have booted into safe mode and still have the problem. I was running Preview 5 so my phone updated to 7.0 stable the day it was released. Everything was running smooth until Saturday night. Now it is about useless. Im hoping someone has a recommendation other than factory reset but I'm afraid that is going to be my only hope. Just don't want to waste another day setting this thing back up.
After many years away from KitKat (2 years?), and a long list of nuisances (5.0 had neverending problems with Xposed, 5.1.1, any version, would close an app out of a sudden, and put my back to a sluggish, slow slow loading Home Screen), i took the decision and go back in time, and reinstall the golden - to me - version of android for the Z1: 4.4.4.
And yes its working fast fast as it should be with so powerful insides.
I dont know whats the problem with the newer versions, its not about lack of power on behalf of the Z1. It feels like memory leaks.
The KitKat isnt much different than every other versions that came after it. Tbh, the whole design got nailed down during IceCream and got prettier and prettier, but its essentially the same alot of years now.
What did i miss from 5.1.1? Quiet Hours. But i downloaded an app that does exactly that. I didnt even bother to root or apply TWRP.
Just wanted a fast computer that can make phones, play media, surf the Internet, make use of VoIP. !
I prefer 5.1.1
Well I have swayed a few times back and forth with 4.4 and 5.1 on my Xperia Z1, I've researched and got to the point where I realized the 5.1 improved this device a lot
Pros:
1. The battery life got a lot better
2. Precise multi touch up to 10 fingers (and more maybe)
3. Design is awesome
Cons:
1. There is some bug with the microphone, when I switch to loudspeaker during a call and switch back to phone mode then the other party will not hear me, so I avoid clicking that "Loud" button
So as you can see, for me there are more pros than cons in the update so I stick with it
I cant argue the fact that for you the 5.1 is working perfectly. Sadly for me its the exact opposite, whether its rooted or unrooted.
The 4.4.4 gives me all the good things the newer versions should give me, sans the updated interface.
Kitkat has slight lag compared to 5.1
On 5.1.1. Greenify is all I ever need off of root. With a little bit of "headroom" thanks to Greenify, I actually have my Z1 clock limited at 1.037GHz. Not laggy and perfectly usable.
i m on 5.1.1 and rooted with custom stock based rom and i dont have any major probs and no lags...m using my phone continuously(camera,watching videos,listening music,internet browsing,downloading files.) and m getting 1 and half day decent battery life i.e very good battery life. if i start using phone little lesser i may get upto 2 days battery life...
İ use Xperia z1 (c6903)5.1.1 .three days ago i uploaded mx rom v8.5.0....Normally everything is very beautiful but battery performance very very bad.i watching movie and The battery draining quickly.example my charge is %35 but later 1 minute %0. My english bad sorry.last month i try 4.3 jb and 4.4.4 kitkat.battery performance is perfectly.i want to back 4.3 jb...
I remember buying a Z1 for €630 when they came out brand new. It was so fast (I had been using phones like the first galaxy mini and iphone 3gs). I noticed even though it's still fast on 5.1 it always felt like it was faster using the older firmware for some reason. I have a Galaxy S7 now but I still own a Z1 too because I think it's still a really good phone, even 3 years later. I'm wondering whether to use a custom rom on the z1 and if so I have no idea which one to choose. The Z1 is a lot better than the first Z in terms of speed and battery life and I think the phone was ahead of it's time when they made it. It was the biggest upgrade from Z to Z1 than any other new Sony phone that came out after that in my opinion. You'd still use a Z1 now but with a Z you'd complain that it's going slow or that the battery is terrible.
As I said though before going too far off topic, I always felt that the phone ran smoother on kitkat than it does on lollipop. I have no idea why, maybe it's the ram usage or the way it reminds me of when I first bought a Z1.