The s4 has a lot of stuff running in background also. Nfc. That eye scanning thingy. Smart stay. Whatever stuff. If u dun use I recommend switching off. Also as usual make sure u close unused apps properly. And off gps if not using too.

Take a look at "BetterBatteryStats" - https://play.google.com/store/apps/details?...terbatterystats

For underclocking and undervolting recommend setcpu. On playstore. However the ability to do noth would depend on whether u are rooted and whether your kernel supports it. If it does u will wanna tread carefully as it can cause your device to crash and the only way to fix would be a factory reset. Uncle benny can shed more light on how much u can reduce the voltage to a minimum of 800mv. I generally reduce all by 75mv for my note 2 to a minimum of 800mv (or if by default already lower I dont touch)

Important : Rooting will be impossible on newer stock kernels

http://forum.xda-developers.com/showthread.php?t=2263788

*on I9500

AndreiLux tells us installing a custom kernel will still allow us to have root access on our Galaxy S4. So what does this new feature really do? It tries to prevent malware from abusing exploits like Exynos-abuse to gain root, and a consequence of that is disrupting how Superuser works on our phones. Solution? Install a kernel with the feature disabled and give up some security for more freedom.

Yes. Running smoothly. 

You still don't get my point
It is not a firmware issue. If so every user will be affected

Or it could be some 3rd party app interference?? If firmware,  every user will be facing it n firmware problem will consistently give you such problems

Ooo...ya lar
Got many custom roms already. I never check on those GT-I9500 Android Development thread. I always browse on the Original Development only....lolz. 

Roms are nothing special really. Almost anyone can make roms hence so many floating around forum of devices that have been around for some time

What will be more important are mods like jkay/simplistic, kernels, themes etc.

if i installed a custom rom like wanamlite for example, would the the camera app crash problem still happen?

It's because majority of the huge markets around the world have the international 4G i9505 model instead of the 3G i9500 model that Malaysia got unlike the S2 and S3 where majority had the base 3G model. So most android community support for the S4 will center around the i9505 instead of the i9500 Galaxy S4.

hmmm, so for rom flasher, it is better to wait for i9505 instead, right?

my s4 cant root..there is no root in the menu....my baseband version is DXUAMDK

just bought SanDisk 32gb class 10 card.  put into phone and copy 4.4gb file. but it stops towards the end...  how to be able to copy files bigger than 4gb?need to format it to another format?

For those users who wanted to have shutter sound On/Off menu on your camera, you can modify the others.xml file located in the /system/csc/ folder to do so. However, only applicable to  ROOTED phone.



Follow steps below:-

1. Find the others.xml file in the /system/csc/ folder. I recommended you to use Solid Explorer with root access.
2. Then open the file using built in text editor.
3. Add below string into the others.xml file as below screenshot.



4. Save the file & restart your phone, then you have activated your camera shutter sound menu. I tested it in our latest firmware version JDQ39.I9500XXUAMDL. 

Erm....if this is true, this indicates 3 things:

1. Bad coding leading to memory leaks in the stock apps.
2. Too many apps running all at once, whereby 2Gb is no longer sufficient.
3. A combination of both.

I suspect it is more to 1 than anything else.

If it is 1 and 2, then may God have mercy upon all of us, and bless us with 64bit ARM with 8Gb RAM.

So... It's pretty much the LTE S4 with CM10, and official Google updates? 

how do i stop this phone from restarting everytime i go into camera and also how do i remove the offline folder from storing up so many pictures?

help is appreciated, thanks...

yeah... waiting CF to make the Auto-root for Octa-Core
well...
did u tested Persus Alpha Kernel?

Any opinion on the audio quality using headphone, as I'm still not satisfied with it even after several hours burn in time. Any recommendation for further improvement.

I use the BM sound mod and the sound more punchy with the bass booster..
http://forum.xda-developers.com/showthread.php?t=2224240