Solution found!

[PanosGR89]

To all of you that your SP lags/freezes when you are in settings - apps or settings - storage I have found the solution! You just have to disable Google Chrome!I didn't even clean install the 4.3 update once again as suggested. I don't know why this program conflicts with settings but who cares...

[blackbox]

I decided to dump Chrome too. The phone hung twice when trying to uninstall the updates - had to do a yellow button reset. In the end I got it to work by clearing Chrome's data first, then uninstalling. Something definitely not right there.

[nsanelazarov]

Just a question. Can you guys multitask while you're in Chrome? 

[blackbox]

Most of the time, yes. It would ocassionally crash Poweramp if I was listening to music. Multitasking is the one thing that got a bit better after updating to .201.

[Danial-mach1]

i can send sms or this kid of works and use chorme by multitasking....not playing music or playing game

[Angelos]

I confirm that unistalling chrome made the phone a lot faster, freed some ram too and when I clean the phones cache it doesn't crash anymore.

[XPeria44]

Yeah stop using Chrome... just use Opera. The phone is quite faster... it's not perfect but seems better.