Guys, i just changed my phonr from s7 to xperia xz...im kinda regret u know
This xperia xz kinda stuttering everytime i unlock my phone or turn on any apps!
I donno about u guys..but s7 certainly is smoother than xperia xz
The camera apps for example, u open the apps even in bright light cobdition, the camera will still look dropped frame rates and looking laggy and after a few shots only the camera goes back smoothly functioning.
Another example, open google chrome on xz, it takes a few second to load and i want to choose which tab to use need to wait again.
Another example, facebook apps...freaking 5sec to load??!! And inside u scroll down it doesn't even feel amooth at all unless u scroll it way down laggily and scroll back up and down again o ly it feels smooth.
Another thing is, i dont know which apps im in everytime after im done i wanna click on recent tab it just lags and need wait fews second like 3 to 6sec only it will load..and after clicked only vibrate feedback no on screen response feedback.
no such lagging on my phone, even when the phone is on stamina mode, it won't lag like yours, you might wanna try to send it back to check