Possible to set Cpu throtteling treshold higher with root?

Hi all,

I'm very annoyed from the Cpu throttling on my Xperia Z3+.
I don't have root, because it's not possible to backup DRM Keys without unlocking Bootloader. But someday it will be possible. ;)
Is it possible to change the treshold of Cpu throtteling? Maybe by editing a File when I have root?.

Sorry for my bad english. :p

Any batteries available for ZF2 with higher capacity?

That would be great! Not just from ASUS but even from a 3rd party vendor.