May I know your device is rooted? if yes can you try to check as follow:
1.Type in su and press enter
2.Reboot your phone
3.Open Terminal Emulator and type:
su (press enter)
4.And then type
dmesg | grep PVS (press enter again)

and then look at the second line ACPU PSV is what number

Benchmark not mean anything, may be sometimes is not accurate also, so just enjoy your device if you not notice any significant perforce issue

I got this problem as well and I posted in here asking before but seem no one replies me and maybe they don't face this issue?

Btw I'm using xperia z

the midland sticker is just to show off that you're using the original XZ la haha
don't worry..the warranty is still there 

Unplanned purchase of Xperia Z. Sony Centre Midvalley lured me by giving me free NFC speaker and also promised a Sony portable charger if I purchase with Maybank card, but only white Xperia Z is available. Only came to know that the NFC speaker is currently out of stock till April and portable charger is purchase-with-purchase at RM99. The salesman compensated the mistake with a laptop bag. To make up for everyone's day, I just gladly taken my new white Xperia Z

I actually wanted black. huhu

black ZL user reporting in

Hey guys,

I read many reviews say Sony Z is battery hog and it cannot really last very long. What your views on this?

And if apply screen protector, will it reduce sensitivity on the touch scren?

sorry, i mean the earphone come together with the set. btw i installed purexaudio mode v5, the result was superb. the sound now is so so much better compared to before. i say a 100% improvement overall. but i still on. 350 firmware tho. any of you here still not update to. 434?
btw anyone using Firefox as browser? i love the interfaces however it seems that got weird bug with the keyboard. always crash when I type to fast especially when replying in this forum. i believe it was Firefox issue as I have no problem with chrome and dolphin.

Aiya, post at my sales thread not here cos here for comment on phone. Not this ley..

U all dowan me to kena ban hammer by mod right

My XZ black has a full rubber border coating. I had a feeling that it was likely to get damaged like that and thus the reason I bought a cover for it. After spending a mini fortune on  the phone, i cant bear to see it calar calar.

yours is Z or ZL?
The Serial Number for Z is just at the bottom of the phone..

Have you tried the bottom of your phone?

marquis, ,philip42
quick question
The SN on your box, not the IMEI, what does it start with? is it CB5 or S01?