[Q] Galaxy S3 Stock - Lags in the UI - Galaxy S III Q&A, Help & Troubleshooting

Hey guys,
I've just unrooted my phone, made a full data wipe (with the mega wipe script ), flashed the new I9300ZSEMA1 via odin.
I reainstalled all the application I had.
My phone it's still (I've done all this to free my phone form the UI's lag maledition ) lagging.
It happens many times when i click bottoms and it has to load smth.
Apart from this, it happens other times casually, event though it's not that evident, but I see there's ppl here saying "my phone it's never lagging", "it's smoother than ever", "it's a beast", etc.. so i want to understand!
Here's my info screen
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
As said, it's stock 4.2.1, unrooted.
I was thinking about installing a kernel like Siyah and manipulating smth about screen from there.
Are there any other options? Which ones?
I've tried (without much of a success ) the subsequent moves:
1 Delevoper Option --> Force GPU rendering [ON]
2 Developer Option --> Disable hardware overlays [ON]
3 Developer Option -->Window animation scale [0.5x]
4 Developer Option --> Transition animation scale [0.5x]
5 Removing Samsung weather widget from the home screen
And that's my current configuration, for what it's worth.
Where would you go from here?
P.S. CAN I SET THE IMAGE RESIZE VIA BBCODE?
Is resizing it previously the only way?

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Why are you messing with settings you clearly know little of? You should never have "Disable hardware overlays" on. That sure as hell won't make your phone smoother.

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thank you for your help, i'm trying to move smth!
what does Disable hardware overlays mean?

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domenicop said:
thank you for your help, i'm trying to move smth!
what does Disable hardware overlays mean?
Click to expand...
Click to collapse
Read this:
Without a hardware overlay every application that is displaying things on the screen will share video memory and will have to constantly check for collision and clipping to render a proper image, this can cost a lot of processing power. With a hardware overlay each application gets its own portion of video memory, getting rid of the need to check for collision and clipping.
Basically, using hardware overlays can reduce CPU usage by quite a bit, so I would leave it enabled.
Source: http://rootzwiki.com/topic/28977-disable-hardware-overlays/#entry778564

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no one?

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Install either Siyah or Perseus kernel and remove bloatware which you don't use

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domenicop said:
no one?
Click to expand...
Click to collapse
Maybe it lags because you're trying too hard to make it not lag, which currently is impossible. Try flashing a heavily debloated rom like WanamLite, then apply gokhan's latest siyahkernel, then try "bestmultitaskingfix v7" and let everything settle for a few days.
Also, don't be worried if it lags a lot just after boot-up, it's bound to do so while caching.

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Theshawty said:
Maybe it lags because you're trying too hard to make it not lag, which currently is impossible. Try flashing a heavily debloated rom like WanamLite, then apply gokhan's latest siyahkernel, then try "bestmultitaskingfix v7" and let everything settle for a few days.
Click to expand...
Click to collapse
that's funny because in the previous post i opened, blaming for the galaxy s3's tendency to lag, everyone was saying the opposite lol