i'm sorry for this update... with 4.2/4.3 my Z is smooth, fast..
with kk all is slowly...
So long story short I see something........something that other non advanced user can't see it.
On 4.3 when you opening anything you can't "exit" application until "opening animation" will be finished. And there you can't interrupt the process even if you pressed "home/back" at that moment. So your animation never lags and always smooth even if you "trying to make a lag"...you just can't.
On 4.4 you can interrupt the animations process. So example if I will open messages or phone or contacts/etc and press home/back on that moment when animation process in the middle we will see micro/animation lags....and that sh!t pissed me off man....really., I don't know about you guys, but I can see that very well.
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer?