I see that "Kies via Wi-Fi" sends only 2.3 kb and receives only 876 bytes the last four hours in my phone, but it uses 26 mins of my phone CPU time and 20% of my phone battery. Is it something that I can stop it? If yes, how to stop it?
Kies via WiFi (a stock ROM app) connects your phone to the Kies software on your computer via WiFi.
I am on CM10.1, which doesn't have Kies via WiFi. BUT, there is probably a setting in the Kies via WiFi app that lets you disable the auto-connect function.
It is an app that is used to update your smartphone or tablet. The only way to kill it is to root your phone and uninstall it. It is a system app and cannot be killed.
open kies via wifi, go to the settings, and turn off Autoconnect.
Settings -> More Settings -> Kies via Wi-Fi -> Settings -> Auto connect off